Boiler Fault Code Stand-by

Also written as STANDBY — same fault.

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

Fault code Stand-by 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 currently in a waiting state and is not actively calling for heat, which usually means it is working correctly but just sitting idle. (As reported on Potterton Envoy Plus)