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

Typical repair cost for the boiler 30 50 70 fault is £150-250 including labour.

30 50 70 High

Boiler Fault Code 30 50 70

Also written as 305070 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 30 50 70 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 is struggling to clear exhaust fumes correctly because it is not detecting the necessary air pressure change to safely start the heating process. (As reported on Chaffoteaux Serelia 24 MFFI)

Pick your boiler brand for the 30 50 70 fix

Chaffoteaux 30 50 70 2 models

Source

Information for the 30 50 70 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