BoilerFaultCodesGlow-worm Pilot Fault Finding Fault Code
Also written as PILOTFAULTFINDING — same fault.
The Glow-worm Pilot Fault Finding fault code means: your boiler's small starter flame will not stay lit, meaning the device cannot safely ignite the main burner to provide heat or hot water.. It appears on 3 Glow-worm models in our database.
Technical description: Pilot will not light with match. Undo tubing nut at pilot burner; if gas does not flow freely, undo tubing nut at pilot outlet of gas valve. If gas flows freely there, change blocked pilot tube. If no gas flow from gas valve, change gas valve.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Glow-worm models that show the Pilot Fault Finding fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Pilot 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