C1 High

Gledhill C1 Fault Code

The Gledhill C1 fault code means: your boiler has tried to light several times but has failed to create a flame, meaning your heating and hot water will not work.. It appears on 1 Gledhill model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: IGNIT ERROR
Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas emergency control valve is in the 'on' positionIf you have a pre-payment meter, ensure you have credit and that the meter hasn't locked outPress the Reset button on the boiler control panel for 3 seconds

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Gledhill models that show the C1 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Gledhill C1 fault code information on this page is sourced and cross-checked against the official Gledhill service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026