Boiler Fault Code Switched Live 'On'

Also written as SWITCHEDLIVEON — same fault.

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

Fault code Switched Live 'On' 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 has correctly received a signal from your thermostat or timer and is successfully starting the heating process as requested. (As reported on Potterton Ultra 2 30 DV)