BoilerFaultCodesGrant GREEN blinking Fault Code
Also written as GREENBLINKING — same fault.
The Grant GREEN blinking fault code means: your boiler is struggling to light reliably because parts inside the burner are either dirty or out of alignment, causing it to hesitate before it starts.. It appears on 6 Grant models in our database.
Technical description: Burner starts with an ignition delay. The ignition electrodes are wrongly positioned; Air output is too high; Nozzle dirty or worn.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Grant models that show the GREEN blinking fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant GREEN blinking fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026