BoilerFaultCodesGlow-worm F62 Fault Code
The Glow-worm F62 fault code means: your boiler has detected an internal electronics failure that prevents it from safely controlling the gas supply, meaning it has shut down for safety.. It appears on 9 Glow-worm models in our database.
Technical description: Main PCB gas valve shutdown fault
What causes the Glow-worm F62 fault?
This fault occurs when the boiler's main control board detects a safety timing issue or an electrical failure when trying to shut off the gas valve. It is typically caused by a malfunctioning circuit board that can no longer communicate correctly with the valve, or a valve that is physically sticking and failing to close when prompted.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Glow-worm models that show the F62 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm F62 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 27 April 2026