When your hot water is not reaching the taps, everyday tasks quickly become frustrating. Before contacting a Gas Safe engineer, there are several practical steps you can take to narrow down the cause. Whether you’re in Bordon or nearby areas such as Liphook, Whitehill, Alton or Farnham, the same troubleshooting process applies to most UK homes.
Quick checks you can do now
These are simple and safe checks that often reveal the issue without needing tools.
- Check whether your boiler is displaying an error code.
- Confirm that both the heating and hot water settings are on.
- Run the tap for 60 seconds to rule out temporary temperature fluctuations.
- Verify that the boiler has power and the fused spur is switched on.
Understanding why no hot water occurs
The phrase no hot water can describe a range of faults, but the most common causes fall into three categories: boiler issues, pump faults and valve problems. Each affects the flow of heated water differently, so identifying which area is responsible saves time and prevents unnecessary repairs.
Is the boiler producing hot water?
If you’re experiencing hot water not reaching taps, first confirm whether the boiler is actually heating water. Combi boilers heat water on demand, while system and regular boilers heat a cylinder. Here are key points to check:
- Boiler display status: Look for flame symbols, temperature readings or fault codes. If the boiler is firing when you open the tap, it is attempting to heat water.
- Water temperature setting: Ensure the hot water temperature hasn’t been accidentally turned down.
- System pressure: Most sealed systems require 1.0–1.5 bar. Low pressure can stop hot water production.
If the boiler does not attempt to fire, the issue may lie with a sensor, diverter valve or control signal. Homes across GU35, GU34 and GU9 frequently experience diverter valve faults in combi boilers because they are used constantly.
Could the problem be with your pump?
In systems with a hot water cylinder, a circulating pump helps move heated water to the cylinder or taps. A pump fault can look identical to a boiler problem from the outside. Try the following:
- Listen for pump activity: A gentle humming sound usually indicates the pump is running.
- Feel for vibration: Light vibration is normal and shows the motor is spinning.
- Check for overheating: An excessively hot pump body can indicate a jammed rotor.
Unlike boilers, pumps do not normally show error codes, so these physical checks are useful. If you live in Bordon or Whitehill and your cylinder heats slowly or inconsistently, a sluggish pump is a likely culprit.
Is the motorised valve stuck?
Motorised valves direct hot water to the correct part of the heating system. A stuck valve is a very common reason for no hot water in homes with hot water cylinders.
Common symptoms include:
- Heating works, but hot water does not.
- The valve feels warm but does not move when the hot water programme activates.
- You hear clicking, buzzing or no sound at all from the valve head.
To identify if this is the problem, place your hand near (not on) the flow pipe leading to the cylinder. If it stays cold even when the boiler is running for hot water, the valve may not be opening.
Checklist: symptoms and likely causes
- Hot water sometimes works, sometimes doesn’t – diverter valve or pump issue.
- Heating works but no hot water – stuck motorised valve or cylinder sensor issue.
- Boiler fires but water stays lukewarm – low flow rate, limescale or sensor fault.
- No boiler response at all – control signal, thermostat or internal boiler fault.
When to stop troubleshooting
It’s perfectly safe to observe, listen and check your controls, but if you suspect an internal boiler fault, electrical issue or failed component, it’s time to contact a Gas Safe engineer. Continuing to investigate inside the casing is not permitted for homeowners and may cause damage. Residents in Bordon and neighbouring towns often see recurring issues with older valves and pumps, so professional assessment is usually the quickest route to a reliable fix.
For friendly advice or to book a professional diagnosis, contact Embassy Gas on (01420) 558993.