BoilerFaultCodesGrant power Fault Code
Also written as POWER — same fault.
The Grant power fault code means: your boiler has lost electrical power and cannot start any heating or hot water functions.. It appears on 3 Grant models in our database.
Technical description: If the boiler is not lit it could be a problem with power supply to the boiler switched off or possibly blown a fuse
What causes the Grant power fault?
This fault occurs when the boiler is not receiving the electrical current required to operate its internal components. The most common reason is a simple blown 3-amp fuse in the fused spur switch or a tripped circuit breaker in your home's main consumer unit. In more serious cases, it can be caused by a surge that has damaged the boiler's main control board.
DIY fix possible
Check that the boiler's main power switch is turned to the 'ON' position.Inspect your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.Check the fused spur switch (usually near the boiler) and replace the 3-amp fuse if it has blown.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Grant models that show the power fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant power 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