BoilerFaultCodesGlow-worm 29 Fault Code
The Glow-worm 29 fault code means: your boiler has stopped working because the internal fan that moves waste gases out of the flue is not spinning.. It appears on 1 Glow-worm model in our database.
Technical description: The fan is stationary and open circuit.
What causes the Glow-worm 29 fault?
This fault occurs when the boiler's control system attempts to start the fan but detects no electrical life or movement from the motor. The most common reason is that the fan motor has burnt out or suffered a mechanical seizure, though it can also be caused by loose wiring or the main circuit board failing to send power to the component.
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 29 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm 29 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