Category: Heating hub

Finding that your heating works but you have no hot water can be frustrating, especially when everything else in your home seems to be running as normal. This guide explains the most common causes, simple checks you can do yourself, and when to call a Gas Safe engineer. Homeowners across areas such as Bordon, Whitehill, Liphook, Alton and Farnham often experience these symptoms during colder months, so the steps below are designed to help you narrow down the fault quickly.

Quick checks you can do now

Before assuming there is a major issue, a few simple checks can help rule out common problems.

• Make sure your hot water demand is set on the programmer.
• Confirm your boiler is not showing a fault code.
• Check that the hot water cylinder thermostat is not turned too low.
• Listen to see if the boiler fires when you turn on hot water.

Here is a quick checklist to run through:

• Water supply on?
• Boiler pressure between 1.0 and 1.5 bar?
• Any recent power cuts?
• Hot water taps fully open?

Common reasons for no hot water

It might feel confusing when radiators heat up normally, yet hot water won’t run warm. The underlying causes are often confined to the hot water side of your system rather than the heating circuit.

• Diverter valve stuck: A very common issue on combination boilers. If the diverter valve sticks in the heating position, the radiators warm up but no hot water flows.
• Faulty cylinder thermostat: In system and heat-only boilers, the cylinder stat may not be requesting heat even when the temperature drops.
• Motorised valve issue: Two-port or three-port valves control heating and hot water flow. If the hot water valve fails, you may get heating only.
• Airlock in the hot water pipework: This is more likely in older properties around GU35, GU34 and GU9 postcodes, where pipework layouts vary.
• Boiler sensor or plate heat exchanger issue: Combination boilers rely on sensors to detect demand and route heat properly. A failure here may affect hot water but not heating.

Understanding your system type

The type of heating system you have affects the likely cause. Many homes in Haslemere, Bordon and surrounding areas use combination boilers, while older homes may use a hot water cylinder. Understanding which system you own helps narrow down the fault.

• Combination boilers: If you have instant hot water with no cylinder, the most common causes include diverter valve failure or blocked plate heat exchangers.
• System or heat-only boilers: These rely on stored hot water in a cylinder. Problems often involve motorised valves, the cylinder thermostat or wiring centre connections.

No hot water but radiator heating works

This situation is common, and the phrase no hot water but radiator heating works usually points to a component dedicated to the hot water supply. With radiators functioning normally, your boiler is successfully generating heat, but the system is failing to send that heat to your taps or cylinder.

Checks specific to combination boilers

Combination boilers supply hot water on demand, so any disruption can quickly affect your taps. If homes in Liphook or Alton report heating working but no hot water, the diverter valve is often the culprit. This valve shifts between heating and hot water; when stuck, it may prioritise heating only.

Other checks include:

• Running a different hot tap to see if the issue is isolated.
• Checking for fluctuating boiler pressure, which may prevent hot water generation.
• Listening for clicking or buzzing inside the boiler, which may indicate a valve attempting to move.

Checks for system and heat-only boilers

These systems use a hot water cylinder. A common sign of a motorised valve fault is when the heating turns on even if only hot water is selected on the programmer. This suggests the valve is not directing flow correctly. Homes in older parts of Bordon and Whitehill often still rely on these systems, making these checks especially useful.

• Feel the pipes going into the cylinder; the flow pipe should heat up during a hot water demand.
• Listen for the motorised valve moving when switching between heating and hot water.
• Check the cylinder thermostat is set between 55 and 60 degrees.

When DIY checks are not enough

While many of the checks above are safe for homeowners, any internal boiler work must be handled by a Gas Safe engineer. Stuck valves, wiring faults, failed thermistors and blocked heat exchangers require proper diagnostics and tools. If you are in Haslemere, Bordon or nearby areas such as Alton or Farnham, a professional assessment will quickly determine whether the issue is mechanical, electrical or related to system flow.

Next steps

If you’ve completed the checks above and still have no hot water, you can book a professional visit at https://www.embassygas.com/book

Why Your Hot Water Runs Cold in Liss When Multiple Taps Are Used

If you live in Liss (GU35) or nearby Bordon, Alton, Liphook or Petersfield, you might notice your hot water feels luke-warm or even cold when two taps are on simultaneously. This frustrating issue often comes down to the output limits of your combi boiler and the flow rate demands of modern households.

How Combi Boiler Output Limits Affect Your Home

Combi boilers heat water directly from the mains, so they don’t require a separate hot water cylinder. While this space-saving design is perfect for many homes in Liss and Whitehill, it also means the boiler’s output rating (in kW) caps how much hot water you can run at once.

• Flow rate: A typical 24 kW combi might deliver around 9–10 litres per minute (l/min) of hot water. If two showers or taps demand 12 l/min in total, the boiler can only heat 10 l/min—leaving you with cooler water.
• Water pressure: Low incoming mains pressure in GU35 or GU32 areas will further reduce the flow rate your boiler sees, making it even harder to keep multiple outlets hot simultaneously.
• Temperature drop: The more water the boiler has to heat at once, the lower the temperature rise it can achieve. This is why the second tap often goes cold.

Liss Troubleshooting: Checking Your Boiler and Pipework

Before calling in a Gas Safe engineer, you can carry out some simple checks to see if it’s a flow-limit issue or something else:

• Test one outlet at a time: Run just your kitchen tap, then your shower. Note the temperature and flow rate. Repeat with both on to compare.
• Check incoming pressure: Look at the pressure gauge on your boiler. Ideally it should be between 1.0 and 1.5 bar cold. If it’s lower, topping up may help—refer to your manufacturer’s manual or ask a professional.
• Inspect filters and valves: Some combi boilers have magnetic or mesh filters on their inlet. A blocked filter can limit flow. Turn off the boiler, isolate the water, and clean the filter if you’re comfortable doing so.
• Look for pipework restrictions: In older homes around Haslemere or Hindhead, narrow pipe runs or scale buildup can choke flow. Flushing the system or repiping critical sections could make a big difference.

Optimising Hot Water Flow in a Busy Household

If you find that your combi boiler’s output is simply too low for your daily routine—especially in larger homes—you have several options:

• Upgrade to a higher-output combi boiler. A 30 kW–35 kW model can deliver 12–15 l/min, ideal for simultaneous showers and taps.
• Consider a system or regular boiler with a separate hot water cylinder if you need constant high volume for families.
• Install thermostatic flow regulators on shower heads to limit the amount of water each outlet draws, balancing your total demand.
• Use a hydrogen-combustion or condensing combi with improved heat exchanger design for a sharper temperature rise.

If you decide on a new boiler installation, our team will recommend the right size and model for your Liss home, ensuring you have enough hot water flow even on busy mornings.

When to Contact a Gas Safe Engineer

Some faults can mimic low output issues. You should call a professional if you notice:

• Fluctuating pressure readings on your boiler display.
• Strange noises or vibrations when heating water.
• No pilot light or electronic ignition failure.
• Repeated low-water-pressure lockouts.

Our certified Gas Safe engineers in Liss and surrounding GU34 regions can diagnose issues quickly and carry out any boiler servicing or repairs needed to restore reliable hot water.

Frequently Asked Questions

1. Why does my shower get cold when the washing machine is on?

Both appliances draw hot water simultaneously, pushing your combi boiler beyond its flow limit. Upgrading to a higher-output model or staggering usage can help.

2. Can I increase flow rate myself?

You can check and clean filters or adjust pressure, but altering internal settings or pipework should be done by a qualified engineer to comply with regulations.

3. Will a system boiler solve this issue?

System boilers work with a hot water cylinder, offering higher stored volume. They’re ideal if you need multiple outlets and lots of hot water back-to-back.

4. Do I need boiler cover if I upgrade?

Yes. Regular maintenance protects your investment. Explore our Boiler cover plans for peace of mind and priority breakdown response.

If you need help with your heating or boiler, our local engineers are here to help. Call us on (01420) 558993 or book online at embassygas.com/book.

Written by Embassy Gas — your local heating experts covering Bordon, Alton, Liphook, Farnham and surrounding areas.

If your boiler or hot water cylinder is suddenly letting water out through the pipe outside, the pressure relief valve may be doing its job—or it may be signalling a fault. Many homeowners around Petersfield, Bordon, Liphook and Alton come across this issue at some point, and it’s often simpler to diagnose than it appears.

What the pressure relief valve does

The pressure relief valve (PRV) is a safety component designed to release excess pressure so your system stays within safe operating limits. When pressure rises beyond the valve’s set point, it opens briefly to discharge water. Occasional tiny releases during heating can be normal; constant dripping is not.

Quick checks you can do now

Before calling out an engineer, you can safely carry out a few simple checks. These won’t fix underlying issues, but they can help you understand what is happening.

• Look at your boiler’s pressure gauge when cold and when hot.
• Check whether your filling loop is fully closed.
• Observe how much water is dripping from the discharge pipe.
• Note whether pressure rises steadily while the heating is on.

Common reasons pressure relief valve leaks occur

There are several causes behind a PRV releasing water, and they vary between boiler systems and unvented cylinders used throughout homes in Whitehill, Farnham and the wider GU35, GU34 and GU9 postcodes.

1. The system pressure is too high

If the pressure climbs above the valve’s threshold—usually around 3 bar—the valve opens to protect the system. This may happen when the boiler is incorrectly topped up or when something is forcing pressure to rise abnormally.

Checklist for homeowners:

• Is the pressure above 2 bar when the system is cold?
• Does the pressure shoot up when the heating comes on?
• Has the system been recently topped up?

2. A stuck or faulty filling loop

A partly open filling loop allows small amounts of water into the system continuously. This gradually increases pressure until the PRV discharges. It’s one of the most common causes we see when visiting homes in and around Bordon.

Ensure both taps of the filling loop are fully closed. The handle position can be misleading, so turn them firmly into the closed position to be certain.

3. Expansion vessel issues

Your expansion vessel absorbs pressure increases when water heats and expands. If its internal air charge has dropped or the diaphragm has failed, the pressure has nowhere to go, forcing the PRV to open. Signs include sharp spikes in pressure when heating starts and rapid drops when heating stops.

4. A worn or damaged PRV

Once a PRV has discharged heavily, debris or limescale may prevent it sealing properly. This results in a constant drip even after the root cause is resolved. A faulty PRV generally needs replacing rather than repairing.

5. Heat exchanger faults

A pinhole in the boiler’s plate heat exchanger can allow mains water to seep into the sealed system. Because mains water pressure is higher, the system pressure gradually rises until the PRV releases water. This requires a Gas Safe engineer for diagnosis, but homeowners can often spot the pattern: a slow, steady rise in pressure even when the boiler is off.

6. Unvented cylinder pressure problems

If you have an unvented hot water cylinder, additional safety valves are present. The TPR (temperature and pressure relief valve) may discharge if either the pressure or the temperature climbs too high. Causes may include expansion vessel faults, blocked expansion pathways or issues with the inlet control group. These cylinders must only be worked on by qualified engineers with the correct certification.

How to reduce the risk of recurring leaks

Preventing pressure relief valve leaks is largely about routine maintenance and keeping an eye on system behaviour.

• Check your pressure gauge occasionally.
• Ensure your filling loop remains shut at all times.
• Book annual servicing to keep expansion vessels healthy.
• Act early—small drips often signal fixable issues.

When it’s time to call a professional

If the pressure rises sharply, the dripping becomes constant or you notice water staining near the discharge point, it’s wise to get the system inspected. Many homeowners in Petersfield and nearby towns such as Liphook and Farnham call once they see repeated discharges because the underlying fault rarely disappears on its own.

Understanding what’s happening helps you discuss the issue clearly with your engineer, but diagnosing and repairing deeper faults—especially anything involving gas appliances or unvented cylinders—must be left to trained professionals.

Next steps: If your pressure relief valve won’t stop dripping, book a professional assessment at https://www.embassygas.com/book

Hard water is a fact of life across much of Hampshire, especially in areas like Bordon, Whitehill, Liphook, Alton, and Farnham. While it’s perfectly safe to use, the minerals it contains can lead to limescale forming inside your heating system. Over time, this scale can restrict water flow, reduce boiler efficiency, and shorten the lifespan of key components. Understanding how boiler scale develops and what you can do to prevent it will help keep your system running smoothly.

Quick checks you can do now

• Run a hot tap and check if the flow seems weaker than usual – a common early symptom of scale.
• Look for white chalky deposits around taps, shower heads, or kettle elements.
• Listen for kettling noises from your boiler, particularly when heating up.
• Check radiator performance for cold spots or slow warm-up.
• Review your last boiler service notes for signs of internal scale.

What is boiler scale build-up?

Boiler scale build-up occurs when dissolved minerals in hard water, mainly calcium and magnesium, are heated and solidify on internal surfaces. This layer of scale acts like insulation, making your boiler work harder to heat water. Homes across GU35, GU34, and GU9 postcodes often see this problem due to naturally high mineral content in local water supplies.

Left unmanaged, scale can accumulate inside heat exchangers, pipework, and hot water cylinders. Even a thin layer can reduce efficiency and increase energy use, so it’s worth dealing with it early.

Why water hardness matters

Hard water isn’t harmful to drink, but it can be tough on boilers. When heated, the minerals crystallise and attach to metal surfaces. Hampshire is known for its chalk geology, which naturally produces harder water. Households in Bordon and neighbouring towns often notice limescale on taps and shower screens – a sign the same thing could be happening inside the heating system.

The harder your water, the faster scale can form. In some cases, homeowners can see noticeable build-up in as little as a year without proper treatment.

Early warning signs of scale forming

Spotting scale early can make a big difference. Watch for these symptoms:

• Kettling noises – a popping, banging, or bubbling sound as water boils unevenly inside a scaled heat exchanger.
• Reduced hot water flow – particularly at taps or showers furthest from the boiler.
• Hot water temperature fluctuations.
• Boiler cycling on and off more frequently.
• Higher-than-usual energy bills.

If you notice one or more of these signs, it’s worth investigating further before small issues become expensive repairs.

How to prevent scale in the first place

The best defence against scale is stopping it before it forms. Several options can help protect your boiler and plumbing:

• System filters: A scale-reducing filter fitted on the incoming cold-water supply helps trap minerals before they enter the boiler.
• Water softeners: These remove hardness minerals entirely, offering a long-term solution for homes in hard water zones.
• Inline scale inhibitors: These devices alter how minerals crystallise, preventing them sticking inside the system.
• Regular servicing: Annual boiler servicing allows engineers to spot early signs of scale and take corrective action.
• Proper system water treatment: Inhibitors added during maintenance help protect against corrosion and scale formation.

Treating existing scale build-up

If scale has already formed, there are safe and effective ways to remove it. A professional Gas Safe engineer can use techniques such as descaling chemicals or powerflushing to break down mineral deposits and restore performance. In Bordon and surrounding areas, this is a common job due to locally hard water.

Descaling may involve circulating a cleaning solution through the boiler to dissolve scale deposits. For systems with extensive build-up, a full powerflush may be recommended to clean radiators, pipework, and the boiler together. Once clean, ongoing treatment prevents the problem returning.

Long-term benefits of keeping scale under control

Taking steps to prevent and manage scale delivers several practical benefits:

• More consistent hot water temperature.
• Reduced boiler wear and tear.
• Lower energy bills due to improved efficiency.
• Quieter boiler operation.
• A longer lifespan for your heating system.

For many households, especially in hard-water postcodes like GU35, GU34, and GU9, a small investment in scale prevention quickly pays for itself.

Next steps

If you’re worried about scale affecting your boiler, book a professional inspection today at https://www.embassygas.com/book

Why Heating Pressure Falls on Freezing Mornings in Headley Down

If you live in Headley Down, you might notice your boiler’s pressure gauge dipping after a particularly cold night. This common issue often stems from contraction leaks – tiny gaps that open up when metal pipes and radiators cool down and shrink. In this article, we’ll explain what contraction leaks are, how to spot them, and the steps you can take to prevent pressure drops in your heating system.

What Are Contraction Leaks?

Contraction leaks occur when metal components in your central heating system contract in low temperatures. As pipes, valves or radiator joints cool, the metal shrinks slightly, creating micro-gaps. Even a hairline gap can allow water to escape, causing your boiler pressure to fall. By day, as everything warms up, these gaps often close again, making leaks hard to detect.

Key Factors in Headley Down Properties

• Older pipework: Many homes in Headley Down have been extended or updated over the years, leading to joints of different materials and ages.
• Exposed pipe routes: Loft or garage installations can leave pipes vulnerable to draughts, speeding up cooling overnight.
• High-pressure systems: If your heating was recently upgraded or you’ve had a new boiler installation, it may run at a slightly higher pressure, making even small leaks more noticeable.

Spotting the Signs of a Contraction Leak

Early detection can save you from a complete heating breakdown on a frosty morning. Keep an eye out for:

• Pressure Gauge Drops: A fall below 1.0 bar on your boiler’s gauge after a cold night.
• Visible Damp Patches: Look under pipework in lofts or utility spaces, especially where pipes run through joists.
• Drips Around Radiator Valves: Check valve ends and wall brackets, which tighten or loosen as metal moves.
• Frequent Refill Needs: If you’re regularly topping up your system each morning, a small leak is likely to blame.

DIY Troubleshooting for Homeowners

Before calling in a professional, try these steps to narrow down the culprit:

• Re-pressurise Safely: Follow your boiler manual to bleed radiators and open the filling loop until the gauge reads 1.2–1.5 bar. Monitor this through a cold night.
• Visual Inspection at Dawn: First thing in the morning, check likely leak points – radiator valves, pipe joints, and under-wall pipe entry points.
• Bleed Your Radiators: Air trapped in a cold system can exaggerate pressure drops. Use a radiator key to release air until water flows steadily.
• Thermal Imaging Phone Apps: Some smartphone gadgets detect cold spots along pipes, highlighting where leaks may be opening.
• Check External Vents: Ensure any outdoor expansion vessels or flue terminals haven’t iced up, which can affect system pressure readings.

When to Call a Gas Safe Engineer

Small DIY efforts can handle minor bleeds and temporary re-pressurisation. However, if you spot signs of water escaping or your pressure continues falling below 1.0 bar, it’s time to contact a professional. A qualified Gas Safe engineer will:

• Locate and repair micro-leaks using leak sealant or replace faulty joints.
• Inspect pipe insulation and recommend upgrades to prevent rapid cooling.
• Perform a full boiler servicing to ensure valves and safety devices are working correctly.

In the Headley Down and Bordon area, our engineers are experienced in pinpointing contraction leaks, working across nearby communities like Alton and Liphook to keep heating systems running smoothly.

Long-Term Prevention Tips

Consistent maintenance can reduce pressure drop issues and extend your heating system’s lifespan:

• Upgrade Pipe Insulation: Adding lagging to accessible pipes in cold lofts or garages stops rapid thermal contraction.
• Install an Inhibitor: System corrosion inhibitors slow down pipework degradation, reducing leak risk over time.
• Consider a New Boiler: If your boiler’s over 10 years old, modern condensing models maintain stable pressures better and are more efficient. Learn more about our new boiler installations.
• Sign Up for Cover: A comprehensive boiler cover plan can give peace of mind, offering emergency call-outs if leaks ever cause a major pressure loss.
• Annual Check-Ups: Book an annual check-up to catch worn hoses, valves and seals before they let water escape.

Frequently Asked Questions

Why does my boiler pressure drop only after a cold night?

Cold temperatures cause metal pipes to contract and form tiny gaps at joints and valves. These micro-leaks allow a bit of water to escape, leading to pressure loss.

Can I top up my central heating system myself?

Yes, you can re-pressurise by following your boiler’s manual. Always shut off the boiler before adjusting the filling loop and aim for 1.2–1.5 bar.

How do I know if I need pipe insulation?

If pipes feel very cold first thing in the morning or you notice condensation, adding foam lagging can reduce contraction and prevent leaks.

Is it expensive to fix contraction leaks?

Minor leaks can often be sealed quickly, but costs rise if pipe sections or fittings need replacing. A local heating engineer can provide an accurate quote after inspection.

If you need help with your heating or boiler issues, our local engineers are here to assist. Call us on (01420) 558993 or book online at embassygas.com/book.

Written by Embassy Gas — your local heating experts covering Bordon, Alton, Liphook, Farnham and surrounding areas.

Boiler pipe and seal leaks are common in older Hampshire homes, especially where copper pipework and rubber seals have aged over decades. Small issues often begin long before homeowners notice visible water, so understanding the early clues can help prevent bigger repairs later. This guide explains how to spot early changes, what they may mean, and when it is time to call a qualified heating engineer.

Quick checks you can do now

Before diving deeper, there are a few simple things you can safely check yourself. These steps do not involve opening the boiler or touching internal components, so they are suitable for most homeowners in places like Bordon, Whitehill, Liphook and the surrounding GU35 and GU34 areas.

• Look for small beads or droplets forming on exposed pipework.
• Check for white or green powdery deposits on copper pipes.
• Feel (carefully) around accessible joints for damp patches.
• Check the boiler pressure gauge for regular unexplained drops.

If anything looks unusual, keep reading to understand what those signs might mean.

Understanding boiler pipe leak signs

The term boiler pipe leak signs covers a range of visual and functional symptoms. In many older properties around Alton and Farnham, the original pipework may have been installed before modern inhibitor chemicals and system protections were common. Over time, this can lead to corrosion, metal fatigue and seal deterioration.

Common early indicators include subtle discolouration, occasional hissing sounds from joints, or faint damp smells near the airing cupboard. These are not always obvious at first, but they tend to worsen if ignored.

Why older homes are more vulnerable

Homes built several decades ago often use copper pipework that has slowly thinned due to internal corrosion. Tiny pinholes can form long before a visible drip appears. Rubber o-rings inside boilers and valves also lose elasticity as they age, especially when exposed to heat cycles for many years.

In parts of Hampshire such as GU9 and the surrounding villages, hard water conditions can speed up the degradation process. Limescale build‑up increases pressure on seals and encourages corrosion in pipes.

Common symptoms homeowners should look for

Some symptoms are simply cosmetic, while others can affect boiler performance. Recognising them early helps avoid expensive water damage or sudden boiler breakdowns.

• White or green deposits: Also known as verdigris, this often appears on copper pipes where tiny amounts of water have evaporated.
• Random pressure drops: A slow pressure loss over several days suggests a small leak somewhere in the system.
• Soft hissing or sizzling noises: Often caused by water escaping through microscopic gaps.
• Damp smells near flooring or skirting: Leaks sometimes run down pipes and collect where they are not easily visible.
• Rusting on steel components: Moisture collecting on metal surfaces usually indicates ongoing leakage.

Checklist: When to monitor vs. when to act

Use this quick checklist to help decide whether you can keep an eye on an issue or whether you should contact an engineer sooner rather than later.

• If the pipework is only slightly discoloured and dry, monitoring is fine for the short term.
• If the pressure drops more than once a week, it is time to call an engineer.
• If any dripping or pooling water is visible, repairs are needed immediately.
• If you notice repeated damp smells, do not ignore them.
• If the boiler fails to hold pressure for more than a day, the leak is likely significant.

When seal failures are the hidden culprit

Not all leaks come from pipework. Internal boiler seals can perish over time, particularly those around pumps, diverter valves and heat exchangers. A failing seal may cause intermittent moisture or only leak when the boiler is running at full temperature.

Homeowners in older properties around Bordon often assume that a pressure drop means a pipe leak somewhere in the house, when in reality the issue may be inside the boiler casing. Only a Gas Safe engineer should investigate internal components, but recognising the clues helps you know when to request professional help.

How small leaks can become bigger problems

Even the tiniest pinhole leak can worsen quickly. Constant heating and cooling cycles expand the pipes, making the gap larger. Moisture can also damage surrounding timber, flooring and insulation. Over several months this can lead to mould, structural damage or circuit board issues inside the boiler.

Slow leaks can cause air to enter the heating system, leading to noisy radiators, poor heat distribution and increased energy usage. The sooner an engineer can assess the situation, the easier and more cost-effective the repair usually is.

Preventing leaks in older heating systems

Prevention plays a key role, especially for homes with pipework dating back 20 years or more. Regular services allow an engineer to inspect seals, joints and system pressure trends. Adding corrosion inhibitor, installing a magnetic filter and flushing old radiators can all reduce long-term risk.

If your home in Whitehill, Liphook or nearby areas has undergone extensions or loft conversions, ensure the heating system has been correctly balanced and updated to match the new layout. Old pipes hidden behind new walls can be overlooked until a leak becomes severe.

Next steps if you suspect a leak

If you have noticed any of the warning signs covered in this guide, it is worth arranging a professional inspection. A qualified heating engineer can identify the source quickly and recommend suitable repairs before further damage occurs. For fast local help, contact us at (01420) 558993.

Why You Hear a Continuous Clicking Sound

If you live in Passfield and your boiler has started making a relentless clicking noise, you’re not alone. That persistent click often comes from the gas valve cycling on and off, signalling an issue that needs attention. In this guide, we’ll explain why gas valve cycling happens, offer step-by-step troubleshooting, and detail when it’s time to call in a qualified Gas Safe engineer.

1. What Is Gas Valve Cycling?

Your boiler’s gas valve regulates the flow of gas into the burner. When you demand heat or hot water, the valve opens to let gas in and closes when the demand is met. That opening and closing can produce a click each time, known as gas valve cycling. Occasional clicks during normal operation are expected, but continuous clicking often signals a fault.

2. Why Continuous Clicking Occurs

Several factors can cause your boiler to cycle the gas valve repeatedly. In Passfield’s cooler months, low temperature demand might make a boiler fire up more often, but when the clicking becomes non-stop, consider these common culprits:

• Low water pressure: If pressure drops below the manufacturer’s recommended level (often 1.0–1.5 bar), the boiler may lock out and attempt to restart repeatedly, producing clicks.
• Thermostat issues: A misreading thermostat or faulty room sensor in Bordon (GU35) could signal the boiler to turn on and off rapidly.
• Air in the system: Trapped air can disrupt water flow, causing the boiler to cycle excessively and click as it tries to ignite.
• Valve or PCB faults: A worn or sticking gas valve or a malfunction on the printed circuit board (PCB) can send repeated ignition commands.

DIY Troubleshooting Steps

Before you call in a professional, you can carry out a few simple checks safely. Always refer to your boiler manual and switch off the power supply before inspecting components.

• Check the pressure gauge: Look at the boiler’s front panel gauge. If it’s below 1.0 bar, you’ll need to repressurise the system using the filling loop. Ensure you follow the manufacturer’s instructions.
• Bleed your radiators: Use a radiator key to release trapped air. You’ll hear a hiss; once water flows steadily, close the valve.
• Reset the boiler: Many modern boilers have a reset button. Press it only once, and wait a few minutes to see if normal operation resumes.
• Inspect the thermostat: If you have a programmable or smart thermostat, check batteries and settings. Temporarily set it to a manual temperature to see if the clicking stops.

If the clicking stops after these steps, monitor your system to ensure it stays resolved. If not, you may be facing an internal fault.

When to Call a Professional Gas Safe Engineer

Continuous clicking that DIY fixes don’t cure often points to a deeper issue requiring specialist knowledge. You should contact a qualified engineer if:

• The boiler locks out with an error code.
• You suspect a gas leak (you smell gas or hear a hissing sound).
• Replacing the PCB or gas valve might be needed.
• You’re unsure about repressurising or bleeding the system safely.

Our local engineers serving areas like Liphook and Petersfield are Gas Safe registered and experienced in emergency boiler repair and servicing. If your boiler needs a full diagnostic or component replacement, don’t delay.

Preventative Maintenance Tips

To reduce the risk of gas valve cycling issues in the future, schedule annual servicing and regular checks.

• Book an annual boiler servicing visit with a Gas Safe engineer. Keeping your boiler clean and well-tuned prevents valve sticking and PCB faults.
• Maintain system pressure by checking the gauge monthly.
• Balance radiators across your home to ensure even water flow, from Farnham to Haslemere.
• Invest in a magnetic filter to capture debris and protect internal components.

Considering a New Boiler Installation

In older boilers, repeated gas valve issues may mean replacement is more cost-effective than ongoing repairs. If your unit is over 10 years old or experiencing other faults like pilot light failures or leaking components, speak to us about new boiler installation. Modern condensing boilers are more efficient, quieter, and less prone to cycling faults.

Protecting Your Boiler with Cover

A comprehensive boiler cover plan offers peace of mind against unexpected breakdowns. Our plans include call-outs for ignition faults and component replacements, so you won’t face surprise bills if your gas valve or PCB fails. Find out more about our boiler cover options.

Frequently Asked Questions

Q: Is a clicking boiler always unsafe?

A: Not always. Occasional clicking during normal ignition is expected. Continuous clicking can indicate a fault, so it’s best to turn off the boiler and seek professional advice.

Q: Can low water pressure cause continuous clicking?

A: Yes. If pressure falls below the recommended level, the boiler may fire and lock out repeatedly, producing clicks. Repressurising to the correct bar often fixes this.

Q: How much does it cost to replace a gas valve?

A: Replacement costs vary by model and labour. A Gas Safe engineer will inspect and quote. You could save by opting for a modern boiler if other parts are aging.

Q: How often should I service my boiler?

A: At least once every 12 months. Annual maintenance keeps components moving freely and prevents repetitive cycling issues.

If you need expert help diagnosing or resolving continuous clicking sounds, our local engineers in Passfield, Bordon, Liphook and beyond are here for you. Call us or book online today.

Written by Embassy Gas — your local heating experts covering Passfield, Bordon, Liphook, Farnham and surrounding areas.

Uneven radiator temperatures are one of the most common heating issues homeowners face. If some radiators are piping hot while others remain frustratingly cool, it usually indicates a simple imbalance or trapped air. The good news is that most of these problems can be diagnosed and improved without major disruption. In homes across Bordon, Whitehill, Liphook, Alton, Farnham and the GU35, GU34 and GU9 areas, these small fixes can make a big impact on comfort and efficiency.

Understanding radiator hot spots cold spots

When a radiator heats unevenly, the underlying cause is normally restricted water flow or trapped air. A fully functioning radiator should heat from the bottom up and from end to end. If this isn’t happening, it’s worth taking a structured approach before calling out an engineer.

Quick checks you can do now

Before diving into balancing or bleeding, run through these simple checks that often resolve the issue immediately.

• Make sure all radiator valves are fully open.
• Check your boiler pressure; most systems need around 1–1.5 bar when cold.
• Ensure the thermostat is calling for heat.
• Confirm the heating programmer or smart system is in heating mode.

Here’s a short checklist to guide you:

• Is the radiator warm at the bottom but cold at the top?
• Is it cold at one end only?
• Are nearby radiators overheating?
• Has the system been noisy or gurgling recently?

Bleeding radiators to remove trapped air

If a radiator is warm at the bottom but cold at the top, trapped air is the most likely culprit. Air pockets prevent hot water from circulating fully. Bleeding is simple, safe, and quick as long as you have a radiator key and a cloth.

Steps to bleed a radiator:

• Turn on your heating and wait for the radiators to warm.
• Switch the heating back off so water isn’t circulating.
• Place a cloth under the bleed valve to catch drips.
• Turn the valve slowly until air escapes with a hissing sound.
• When water begins to flow steadily, close the valve.
• Check boiler pressure and top up if necessary.

This usually fixes cold tops immediately, especially in older homes around Bordon and the surrounding villages where trapped air is common after system work.

Balancing radiators for even heat distribution

If some radiators are far too hot while others barely warm up, your system likely needs balancing. Balancing ensures that heated water flows evenly to every radiator, not just the nearest ones to the boiler.

Signs your system needs balancing:

• Radiators closest to the boiler heat up very quickly.
• Distant radiators remain lukewarm even during long heating cycles.
• Your home heats unevenly, with cold rooms in regular use.

To balance radiators, you adjust the lockshield valve—the small capped valve on one side. The goal is to restrict flow to the hottest radiators and allow more flow to the cooler ones.

Basic method:

• Turn heating on and let all radiators fully warm.
• Note the order in which they heat from fastest to slowest.
• Close the lockshield valve on the hottest radiators slightly.
• Open the lockshield valve more on the cooler radiators.
• Give the system time to settle and reassess.

Balancing can be a bit of a patience test, but it’s one of the most effective ways to eliminate uneven heating. In properties across Whitehill and Liphook, especially older systems with long pipe runs, this process often restores consistent warmth without further work.

Improving system zoning for better control

Even after bleeding and balancing, some homes—particularly larger ones—benefit from better zoning. Zoning divides your heating system into independent areas, each with its own control. This is common in multi-storey homes around Farnham and Alton, where ground floors and loft rooms heat at very different rates.

Zoning can involve:

• Installing thermostatic radiator valves (TRVs).
• Adding motorised zone valves.
• Setting up smart controls for individual rooms.

TRVs alone can make a big difference by preventing certain rooms from overheating. They allow your system to divert flow to colder radiators automatically.

What to do if problems persist

If you’ve tried bleeding, balancing and adjusting TRVs but still have stubborn hot or cold spots, there may be other factors at play.

Possible causes include:

• Sludge buildup restricting water flow.
• A failing pump not circulating water properly.
• Incorrect pipework or historic system modifications.
• Partially closed valves that were overlooked.

Sludge buildup is especially common in older central heating systems around GU35 and GU34, where radiators may not have been flushed in many years. A professional power flush or chemical clean can restore performance if sludge is the issue.

When to call a professional

While most homeowners can bleed radiators and carry out simple checks, deeper balancing or diagnosing hidden system faults can take time and specialist tools. A Gas Safe heating engineer can:

• Measure temperature drops across radiators accurately.
• Check pump speeds and system pressure settings.
• Inspect pipework for blockages or incorrect routing.
• Identify early signs of corrosion or sludge buildup.

If your radiators have been inconsistent for years or you are planning upgrades like new TRVs or smart zoning, professional assessment is often the quickest and most cost‑effective route to a stable, efficient system.

Next steps: for expert help resolving uneven radiator temperatures, contact us on (01420) 558993.

If you’ve just had your central heating system refilled in Bordon and noticed some radiators staying cold at the top, you’re likely dealing with trapped air. This common issue can cause uneven heating, higher energy bills and noisy pipes. In this guide, we’ll explain what’s happening, show you how to bleed radiators safely and share expert tips to prevent it from happening again.

Understanding Why Radiators Go Cold After System Refill

When your heating engineer refills the system—perhaps after a repair or a power flush—air can become trapped in the pipework or radiator bodies. Unlike water, air rises within radiators and collects at the top, blocking hot water from circulating properly. The result is a chilly radiator head and a warm base.

Signs of Trapped Air in Your Radiators

• Partial warmth: Radiators that are hot at the bottom but cold at the top.
• Gurgling or rumbling noises when the heating runs.
• Uneven temperatures across your radiator network.
• Pressure drops on your boiler’s gauge after refilling.

Step-by-Step Guide to Bleeding Your Radiators

Bleeding a radiator is a simple DIY task that can restore even heat distribution. Follow these steps carefully:

• Switch off the boiler and allow radiators to cool. Working on a cold system prevents hot water burns.
• Place a cloth or small container under the bleed valve (usually on the side or top corner of the radiator).
• Insert a radiator key or flat-head screwdriver into the bleed valve.
• Turn the valve counter-clockwise slowly. You’ll hear a hiss as air escapes.
• When water starts to drip steadily, close the valve by turning it clockwise.
• Check the boiler pressure gauge; if it’s dropped below the recommended level (typically 1–1.5 bar), use the filling loop to top up. Always follow your boiler manual.

Checking System Pressure and Other Considerations

After bleeding, maintaining correct pressure is vital:

• Locate the pressure gauge on your boiler. If it’s below 1 bar, increase pressure slowly via the filling loop.
• A sudden refill can introduce more air—bleed again if you notice any hissing.
• If pressure drops frequently, you might have a leak or faulty component that needs professional attention.

When to Call a Professional Gas Safe Engineer

If bleeding and basic checks don’t solve the problem, it’s time to call a Gas Safe engineer. In nearby villages like Alton, Liphook and Petersfield, our experts can quickly diagnose and fix complex issues:

• Persistent airlocks that need a thorough system flush.
• Radiator valves or pump failures causing uneven heat.
• Boiler faults triggering repeated pressure loss or noisy operation.

For major updates or if you’re thinking about a new boiler installation, our team in Farnham and Whitehill can help you choose the right high-efficiency model and complete the work safely.

Regular boiler servicing reduces the risk of airlocks and breakdowns, and adding inhibitor chemicals during a service prevents sludge and corrosion.

To avoid unexpected repair bills, consider our comprehensive boiler cover plans—perfect for homeowners in the GU35 area and beyond.

Preventing Future Problems

Proactive maintenance keeps your radiators and boiler running smoothly:

• Annual boiler servicing by a qualified engineer.
• Power flushing your system every 4–6 years to remove sludge.
• Top up inhibitor levels annually when bleeding radiators.
• Monitor your system pressure monthly and bleed any radiators showing airlocks.

Frequently Asked Questions

Why do I get air in my system after a refill?

Refilling allows fresh air into the pipes and radiators. Bleeding releases this trapped air, restoring proper water flow.

Can I leave my boiler off while bleeding radiators?

Yes. Always switch off and let everything cool to avoid hot water burns.

How often should I bleed my radiators?

Once or twice a year is usually enough. If you refill or notice noises mid-season, bleed them again.

If you need help with your heating or boiler, our local engineers are here to help. Call us on (01420) 558993

Written by Embassy Gas — your local heating experts covering Bordon, Alton, Liphook, Farnham and surrounding areas.

Why Does My Boiler Take Longer to Ignite?

If you’ve noticed your boiler in Kingsley is slower to fire up, you’re not alone. From Kingsley to nearby Bordon, Alton and Liphook, ignition wear can affect efficiency and comfort in homes across the region. In this guide, we’ll explore the causes, symptoms and solutions to help you restore fast, reliable heating.

What Is Ignition Wear?

Ignition wear refers to the gradual deterioration of components responsible for starting your boiler. Over time, spark electrodes, sensors and burners can become corroded or dirty, leading to longer ignition times or failed starts. While some wear is unavoidable, regular care can slow the process and keep your system running smoothly.

Common Causes of Ignition Delays in Kingsley Boilers

• Spark Electrode Erosion: Over time the electrode tip wears away, producing a weaker spark that struggles to light the gas.
• Dirty or Clogged Burner Nozzles: Residue and soot build up on the burner ports, disrupting the gas-to-air mix needed for a swift ignition.
• Weak Flame Detection Sensors: These sensors verify a stable flame; if they’re coated in debris or worn out, the boiler can take multiple attempts to stay lit.
• Gas Supply Variations: Fluctuating pressure or partially closed meters reduce fuel supply. Ensure your gas meter is fully open for adequate pressure in Kingsley and the wider GU35 region.

Signs Your Boiler Ignition Is Wearing Out

• Extended Ignition Time: The boiler takes longer than usual to light, often exceeding 30 seconds.
• Multiple Ignition Attempts: You hear repeated clicking as the system tries to spark up.
• Unusual Noises: Popping or rattling during ignition can indicate burner or ignition issues.
• Frequent Lockouts: Safety features may shut down the boiler after failed ignition.

How to Troubleshoot and Maintain Your Boiler’s Ignition System

Trying some basic checks can help you pinpoint the issue and save time before calling in professional help.

• Turn Off and Restart: Use your boiler’s reset button, wait a few minutes, then restart to clear minor faults.
• Check for Error Codes: Modern boilers display a code when ignition fails. Refer to your manual to decode the warning.
• Inspect the Ignition Electrode: Look for signs of pitting or soot buildup. Wiping the electrode with a soft cloth can improve performance.
• Clean the Burner and Injector Ports: Gently remove dust and debris to ensure a proper fuel-air mix.
• Review Fuel Supply: Ensure gas meters and valves are fully open for adequate pressure in Kingsley and neighbouring areas.

Safety First: When to Call a Gas Safe Engineer

If you’re not comfortable handling gas appliances, it’s time to call a professional. Our Gas Safe engineer can carry out thorough checks, repairs and recommend any replacements, ensuring safety and compliance.

Upgrading or Replacing Components

When ignition wear is beyond simple cleaning, replacing parts can restore peak performance. We offer affordable new boiler installation services as well as individual component swaps, such as electrodes or sensors.

Preventive Maintenance Tips

Regular servicing significantly reduces ignition issues and prolongs boiler life. Book annual boiler servicing with Embassy Gas to keep your system running smoothly. Pair this with a bespoke boiler cover plan for worry-free protection throughout the year.

Frequently Asked Questions

Q: How often should I replace the ignition electrode?

A: Typically every 5–7 years, but a check during annual servicing can confirm its condition and performance.

Q: Can a dirty burner really cause ignition delays?

A: Yes. Even small amounts of soot disrupt the fuel-to-air ratio, making ignition slower and less reliable.

Q: Why does my boiler occasionally lock out?

A: Lockouts are a safety measure triggered by failed ignition attempts. Reset the boiler, but if it persists, call an engineer to investigate underlying issues.

If you need help with your heating or boiler, our local engineers are here to help. Call us on (01420) 558993 or book online at embassygas.com/book

Written by Embassy Gas — your local heating experts covering Bordon, Alton, Liphook, Farnham and surrounding areas.