BoilerFaultCodesYour boiler has failed to light, which means you will not have any heating or hot water until the issue is resolved.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Ignition electrode and lead (faulty connection, spark gap or position), igniter failure, or gas supply issues.
What causes this fault?
This fault occurs when the boiler's control board attempts to start the burner but fails to detect a flame after several attempts. The most common reasons are a lack of gas reaching the unit, a worn-out ignition spark that can no longer light the fuel, or a dirty internal sensor that cannot see the flame even if it has successfully lit.
This fault is frequently seen during extreme cold snaps, as external gas regulators can freeze or condensation pipes can block, preventing the ignition process from completing.
DIY fix possible
Check that your gas meter has credit and the gas emergency control valve is open.Verify that other gas appliances in your home, such as a hob, are working.Press and hold the 'R' (Reset) button for at least 2 seconds to see if the boiler restarts.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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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