BoilerFaultCodes.com
1 High

Your boiler has tried to light but failed, meaning your heating and hot water will not work until it is reset or repaired.

Technical description: Ignition failure
Typical repair cost: £80-250 (including labour)

DIY fix possible

Check that your gas supply is turned on and other gas appliances are workingPress and hold the 'R' reset button for several secondsEnsure your condensate pipe has not frozen if it is very cold outside

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Protect yourself from future repair bills

A boiler cover plan would cover faults like 1 — no call-out fees, no surprises.

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Parts commonly replaced

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