OC Low

Boiler Fault Code OC

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code OC appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is functioning normally and is currently using an outdoor weather sensor to automatically adjust the temperature of your heating. (As reported on Heatline Sargon 24)

Pick your boiler brand for the OC fix

Heatline OC 3 models

Source

Information for the OC 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