BoilerFaultCodes OC Low
Boiler Fault Code OC
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code OC appears across 1 boiler brand and 6 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 outdoor temperature sensor and has automatically turned on a feature that adjusts your heating based on the weather outside. (As reported on Heatline Sargon 28)
Pick your boiler brand for the OC fix
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 27 April 2026