GREEN Low

Grant GREEN Fault Code

The Grant GREEN fault code means: your boiler is working exactly as it should and is currently ready to provide heating and hot water.. It appears on 6 Grant models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Normal operating position

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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Grant models that show the GREEN fault code

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

Source

Grant GREEN 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