OVERHEAT panel LED lit High

Grant OVERHEAT panel LED lit Fault Code

Also written as OVERHEATPANELLEDLIT — same fault.

The Grant OVERHEAT panel LED lit fault code means: your boiler has switched itself off because it has become too hot internally, likely due to a blockage or a pump issue stopping the water from moving.. It appears on 1 Grant model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Boiler overheat thermostat operated — boiler off; check circulation and reset
Typical repair cost £100-280 (including labour)

DIY fix possible

Check that all radiator valves are fully open and there is no air trapped in the systemEnsure the system pressure is between 1 and 1.5 bar on the pressure gaugeOnce the boiler has cooled down, locate and press the manual reset button on the overheat thermostat behind the front casing

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Grant models that show the OVERHEAT panel LED lit fault code

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

Source

Grant OVERHEAT panel LED lit 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