54 Emergency

Grant 54 Fault Code

The Grant 54 fault code means: your boiler is struggling to get enough fresh air, which means the ventilation in the room where it is installed is insufficient for the unit to run safely.. It appears on 6 Grant models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Vent E (in²)
Typical repair cost £100-250 (including labour)

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 54 fault code

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

Source

Grant 54 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