Boiler Keeps Turning Off
Gas Safe Reg. 980201• Same-day across Bradford, Leeds & Yorkshire
If your boiler fires for a few minutes then shuts down — or won't start at all and shows a fault code on the display — it's locking out for safety. Modern boilers do this to protect you, but the underlying fault needs a Gas Safe engineer to diagnose properly. We attend lock-outs across Yorkshire daily and fix most on the first visit.
Most likely causes
- 1Overheating due to blocked heat exchanger or pump failure
- 2Ignition electrode or flame sensor fault
- 3Low water pressure triggering safety cut-out
- 4Blocked or frozen condensate pipe (winter)
- 5Faulty PCB / control board misreading sensors
- 6Gas valve not opening fully or inconsistent gas pressure
- 7Air pressure switch fault (flue or fan issue)
What you can safely check first
Look at the gauge — if it's below 0.5 bar, top up via the filling loop to 1.0–1.5 bar. Many lock-outs are simply low pressure.
In freezing weather, the white plastic pipe outside can ice up. Pour warm (not boiling) water over it to thaw. Reset the boiler afterwards.
Write down the exact code (F22, F75, EA, L2 etc.). It tells us exactly which sensor or component is triggering the lock-out so we bring the right part.
- Smell of gas when the boiler tries to ignite
- Fault code repeats immediately after reset — don't keep resetting
- Boiler is very old (15+ years) and locking out repeatedly — replacement may be safer
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