How much does it cost to fix boiler error code ERROR CODE 5?

Typical repair cost for the boiler ERROR CODE 5 fault is £90-160 including labour.

ERROR CODE 5 High

Boiler Fault Code ERROR CODE 5

Also written as ERRORCODE5 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code ERROR CODE 5 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 problem with the internal sensor that monitors the temperature of the water for your radiators. (As reported on Ideal Icos HE)

Pick your boiler brand for the ERROR CODE 5 fix

Ideal ERROR CODE 5 2 models

Source

Information for the ERROR CODE 5 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