BoilerFaultCodesYour boiler is unable to light the gas flame needed to heat your home or water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Ignition failure
What causes this fault?
This fault occurs when the boiler attempts to start up but cannot establish or detect a flame. The most common reasons include a lack of gas reaching the unit, a worn-out electrode that can no longer create a spark, or a build-up of carbon that prevents the sensor from 'seeing' the flame. It can also be caused by an internal electronic failure where the boiler's computer fails to open the gas valve correctly.
This fault is more common in winter, as extremely cold temperatures can cause external gas regulators to freeze or condensation pipes to block, both of which prevent successful ignition.
DIY fix possible
Check that your gas supply is turned on at the meterCheck if other gas appliances (like a hob) are workingPress the Reset button on the boiler control panelEnsure your condensate pipe has not frozen if it is very cold outside
Find a Gas Safe engineer
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Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E01 — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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