BoilerFaultCodesGrant 92 Fault Code
The Grant 92 fault code means: your boiler is signalling that the dedicated air supply vent required for safe combustion is too small or restricted, which is preventing the boiler from drawing enough fresh air to operate safely.. It appears on 6 Grant models in our database.
Technical description: Vent E (in²)
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 92 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant 92 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