Boiler Fault Code NO CH OPERATION

Also written as NOCHOPERATION — same fault.

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

Fault code NO CH OPERATION 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 not receiving a signal to turn on the heating, which is usually caused by an external control setting or a simple adjustment rather than a broken internal part. (As reported on Ideal Logic Max Heat 2)