BoilerFaultCodesYour boiler has failed to ignite properly and is currently trying to clear its internal system before attempting to start again.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Error during start-up or operation; followed by a 3 minute venting cycle
What causes this fault?
This fault occurs when the boiler's control system cannot detect a steady flame after trying to ignite several times. The most common reasons are a lack of gas reaching the burner, a build-up of carbon on the ignition parts, or a sensor failing to tell the boiler that the fire has successfully lit. This leads the unit to enter a safety venting cycle to clear any unburnt gas before it tries again.
This issue is more frequent during extreme cold snaps, as external gas meters can occasionally freeze or supply pressures can drop when local demand is at its peak.
DIY fix possible
Check that your gas emergency control valve is in the open positionEnsure other gas appliances in your home are working to confirm gas supplyPress and hold the 'Reset' button for two seconds once the 3-minute venting cycle has finished
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 E1 — no call-out fees, no surprises.
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Remeha Avanta 18V is discontinued — time for a new one?
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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