How much does it cost to fix boiler error code 30 40 50 70 80?

Typical repair cost for the boiler 30 40 50 70 80 fault is £150-300 including labour.

30 40 50 70 80 Emergency

Boiler Fault Code 30 40 50 70 80

Also written as 3040507080 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 30 40 50 70 80 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a flame signal when it shouldn't be running, which indicates a potential internal problem with the gas safety detection system. (As reported on Chaffoteaux Serelia 24 MFFI)

Pick your boiler brand for the 30 40 50 70 80 fix

Chaffoteaux 30 40 50 70 80 2 models

Source

Information for the 30 40 50 70 80 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