Boiler Not Igniting? A Simple Troubleshooting Guide for Whitehill Homeowners
If your boiler won’t ignite, it’s more than just an inconvenience – it’s a disruption to your daily routine and can mean chilly rooms in Whitehill and neighbouring villages like Bordon, Alton and Liphook. Before you call out a Gas Safe engineer, there are a few safe checks you can do yourself. This step-by-step guide is designed for homeowners in GU35 and nearby GU34 areas, helping you troubleshoot common ignition issues and decide if you need professional help.
Why Your Boiler Might Not Ignite
Modern boilers have built-in safety measures and diagnostic displays, but ignition problems can still occur. Common reasons include:
- Power supply interruptions
- Low water pressure
- Thermostat or programmer errors
- Faulty pilot light or ignition electrodes
- Closed gas valve or gas supply issues
- Error codes or internal safety lockouts
Before You Begin: Safety First
Always prioritise safety when working near your boiler. If at any point you smell gas, shut off the supply immediately, open windows, avoid using electrical switches, and contact the National Gas Emergency Service on 0800 111 999. For non-emergencies, remember:
- Switch off the boiler and allow it to cool.
- Read the manufacturer’s manual for specific instructions.
- Use a sturdy step ladder if you need to reach the boiler controls.
- Wear protective gloves if you need to touch metal parts.
Troubleshooting Steps
1. Check the Boiler Power and Reset
Ensure the boiler’s power switch or isolator is turned on. A tripped MCB (Miniature Circuit Breaker) in your fuse box can cut power. If you spot a tripped switch, flip it back. Many boilers feature a reset button; press and hold it according to the manufacturer’s instructions. If the boiler ignites after a reset, monitor it for recurring faults, as frequent resets may indicate an underlying issue.
2. Inspect Water Pressure
Low water pressure can prevent ignition. On the boiler pressure gauge, look for a reading between 1 and 1.5 bar when cold. If it’s below 1 bar, use the filling loop valves to top up the system. Open both valves slowly until the pressure rises, then close them. Recheck the gauge; if pressure drops repeatedly, you may have a leak or need professional boiler servicing.
3. Verify Thermostat and Programmer Settings
Sometimes the issue is as simple as incorrect controls. Make sure your room thermostat is set higher than the current room temperature, and that the timer or programmer is set to demand heat. Reset any ‘holiday mode’ or frost protection settings that might override normal operation.
4. Relight the Pilot Light (Where Applicable)
Older boilers may have a pilot light instead of electronic ignition. Check your boiler manual for the relighting procedure. Typically, you:
- Turn the control dial to ‘Pilot’ and press it.
- Use a long match or lighter at the pilot flame opening.
- Hold the dial for 10–15 seconds once the pilot lights, then release gently.
- If the pilot won’t stay lit, the thermocouple could be faulty.
If you’re not comfortable relighting the pilot, it’s best to call a qualified Gas Safe engineer.
5. Check the Gas Supply
Confirm that your mains gas supply is on and the meter lever is in the correct position. If you suspect a local outage, ask neighbours in Petersfield (GU34) if they have gas. Remember, only qualified professionals can work on your gas valve or internal pipework.
6. Look for Error Codes
Modern boilers display error codes when ignition fails. Consult your boiler’s user guide to decode the message. Common codes relate to flame detection faults, sensor failures or blocked condensate pipes. If you see the same code repeatedly, record it and share it with your engineer.
When to Call a Professional
After running these checks, if your boiler still won’t fire up, it’s time to seek expert help. Persistent issues—like pressure loss, ignition lockouts or suspected gas leaks—require attention from a qualified Gas Safe engineer. Our team covers Whitehill, Bordon, Alton and Liphook, and can handle everything from new boiler installations to complex repairs.
Preventative Maintenance Tips
Regular maintenance helps avoid ignition problems and extends the lifespan of your system:
- Arrange annual boiler servicing before winter arrives.
- Bleed radiators to remove trapped air, improving circulation.
- Check condensate pipes for ice blockages in colder months.
- Insulate external pipes and drains to prevent freezing.
- Consider signing up for a breakdown cover plan for added peace of mind.
Frequently Asked Questions
Q: How do I reset my boiler safely?
A: Locate the reset button on your boiler panel. Press and hold it for the time specified in your manual, usually 10 seconds. Wait for the boiler to attempt ignition. If there’s no restart, check for error codes.
Q: Can I relight the pilot light myself?
A: Yes, if your boiler has a pilot flame. Follow the instructions in your handbook, ensure the area is well ventilated, and never force components that seem stuck.
Q: Why is my boiler pressure dropping?
A: Pressure loss can result from leaks in the system, a faulty expansion vessel or routine water loss. Top up the system, but if it falls again, arrange professional servicing.
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, Petersfield and surrounding areas.