How much does it cost to fix boiler error code NOT OPERATING IN HEATING MODE?

Typical repair cost for the boiler NOT OPERATING IN HEATING MODE fault is £120-280 including labour.

NOT OPERATING IN HEATING MODE High

Boiler Fault Code NOT OPERATING IN HEATING MODE

Also written as NOTOPERATINGINHEATINGMODE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code NOT OPERATING IN HEATING MODE 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 is receiving power but fails to respond when the heating is scheduled to turn on, likely due to a communication failure between the controls and the unit. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the NOT OPERATING IN HEATING MODE fix

Johnson Starley NOT OPERATING IN HEATING MODE 1 model

Source

Information for the NOT OPERATING IN HEATING MODE 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