BoilerFaultCodesGlow-worm Electrical Supply Failure Fault Code
Also written as ELECTRICALSUPPLYFAILURE — same fault.
The Glow-worm Electrical Supply Failure fault code means: your boiler has stopped working because it has lost its electricity supply, but it should restart automatically once the power is back on.. It appears on 3 Glow-worm models in our database.
Technical description: Failure of the electrical supply will cause the burner to go out. Operation will normally resume on the restoration of the electrical supply. If the burner does not relight and the reset/standby indicator is lit, turn the burner temperature control to '0', wait 30 seconds, then fully clockwise to 'Max.'
DIY fix possible
Check your home's main fuse box (consumer unit) to ensure no circuit breakers have tripped.Verify that the fused spur switch feeding the boiler is in the 'on' position.Turn the boiler temperature control to '0', wait 30 seconds, then turn it fully clockwise to 'Max' to trigger a reset.
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Glow-worm models that show the Electrical Supply Failure fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Electrical Supply Failure fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026