How much does it cost to fix boiler error code code9?

Typical repair cost for the boiler code9 fault is £80-200 including labour.

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Boiler Fault Code code9

Also written as CODE9 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code code9 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because an external safety device, such as a thermostat or pressure switch, has detected an issue and broken the electrical circuit. (As reported on Remeha Avanta 18V)

Pick your boiler brand for the code9 fix

Remeha code9 1 model

Source

Information for the code9 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026