An error code isn't a mystery breakdown — it's your boiler telling you exactly what's wrong. Pick the code shown on your display to find out what it means, which checks you can safely do yourself, and when you absolutely need to call a professional.
Most common codes
Boiler error code F28 — what should you do?
Your boiler can no longer light. In most cases, this is repaired in a single visit.
Error code F28Boiler error code F75 — what should you do?
Your boiler no longer detects water flow properly. Usually the pump or the pressure sensor.
Error code F75Boiler error code F22 — what should you do?
Your boiler is short of water in the heating circuit. This is usually the simplest fault to fix.
Error code F22Boiler error code F29 — what should you do?
Your boiler starts normally, then switches itself off while running. The flame cuts out without warning.
Error code F29Boiler error code F20 — what should you do?
Your boiler detected an excessive temperature and shut down as a safety measure. A prompt repair prevents it from happening again.
Error code F20Boiler error code F54 — what should you do?
Your boiler is reporting a flame detection fault, often linked to the gas valve. An accurate diagnosis is needed.
Error code F54Can't find your code? Call us, we'll help.
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