WAIT BOILER THERMOSTAT Low

Grant WAIT BOILER THERMOSTAT Fault Code

Also written as WAITBOILERTHERMOSTAT — same fault.

The Grant WAIT BOILER THERMOSTAT fault code means: your boiler is currently performing an essential safety cooling process after finishing a burn cycle; please wait a few minutes for the status message to change before attempting any interaction with the unit.. It appears on 1 Grant model 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: Burner burn-down status; do not open the front combustion chamber access door until this message is displayed.

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 WAIT BOILER THERMOSTAT fault code

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

Source

Grant WAIT BOILER THERMOSTAT 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 27 April 2026