BoilerFaultCodesGlow-worm Electrical Fault Finding Fault Code
Also written as ELECTRICALFAULTFINDING — same fault.
The Glow-worm Electrical Fault Finding fault code means: your boiler is not receiving the electrical power it needs to start, likely because the external clock or thermostat is not sending a signal to turn it on.. It appears on 3 Glow-worm models in our database.
Technical description: No 220 to 240V between 'L' and 'N'. Check that all remote time or temperature controls are calling for duty.
DIY fix possible
Check your thermostat and make sure it is set to a temperature higher than the current room temperature.Verify that your heating programmer or timer display is active and set to 'On' for the current time.Check your home's fuse box or consumer unit to ensure the boiler's circuit breaker has not tripped.
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Glow-worm models that show the Electrical Fault Finding fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Electrical Fault Finding 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