BoilerFaultCodesGrant 10 Fault Code
The Grant 10 fault code means: your boiler is struggling to clear its exhaust gases properly, which can be dangerous and indicates a potential issue with your chimney or ventilation.. It appears on 10 Grant models in our database.
Technical description: Fumes and puffing during starting (conventional flue). Check the condition of the chimney, ensure it is not blocked and is high enough to produce the required draught. Check that there is an adequate air supply near the burner and that a kitchen fan is not drawing products out of the burner.
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 10 fault code
Click a model for the full fault code list and model-specific repair notes.
- Euroflame Repair: £150-350
- Euroflame Condensing Repair: £120-350
- Vortex Repair: £150-300
- Vortex 15-20 Repair: £120-250
- Vortex 20-26 Repair: £120-250
- Vortex Eco Repair: £120-250
- Vortex Eco External Floor Standing Repair: £120-250
- Vortex Eco External Wall Hung Repair: £120-250
- Vortex Pro Repair: £150-350
- Vortex Pro 15-26 Repair: £120-250
Source
Grant 10 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