501 High
Your boiler is failing to light the gas flame required to heat your water and radiators.
Technical description: No flame detected
Typical repair cost: £100-350 (including labour)
DIY fix possible
Check if other gas appliances, like a hob, are working to ensure gas is reaching the propertyEnsure your gas pre-payment meter (if applicable) has creditCheck that the gas isolation valve under the boiler is in the open positionPress the Reset button on the boiler control panel
Protect yourself from future repair bills
A boiler cover plan would cover faults like 501 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition Electrode
- Flame Sensing Probe
- Gas Valve
- PCB
*Affiliate links — we may earn a commission at no extra cost to you.