How much does it cost to fix boiler error code ERROR CODE 4?

Typical repair cost for the boiler ERROR CODE 4 fault is £150-300 including labour.

ERROR CODE 4 High

Boiler Fault Code ERROR CODE 4

Also written as ERRORCODE4 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code ERROR CODE 4 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 detected an issue with its internal airflow or ventilation system, preventing it from safely starting up. (As reported on Ideal Excel HE)

Pick your boiler brand for the ERROR CODE 4 fix

Ideal ERROR CODE 4 1 model

Source

Information for the ERROR CODE 4 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 7 July 2026