Boiler Fault Code Error in power supply

Also written as ERRORINPOWERSUPPLY — same fault.

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

Fault code Error in power supply appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to detect the correct amount of electrical power from your home's mains supply, causing it to shut down to prevent damage. (As reported on Halstead Finest Gold)