Overheat - Red LED: FLASHING High

Potterton Overheat - Red LED: FLASHING Fault Code

Also written as OVERHEATREDLEDFLASHING — same fault.

The Potterton Overheat - Red LED: FLASHING fault code means: your boiler has switched itself off because it got too hot, likely due to a temporary blockage or a pump issue, and it needs to be manually restarted once it has cooled down.. It appears on 2 Potterton models 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: The overheat thermostat has operated; requires manual re-setting.
Typical repair cost £100-280 (including labour)

DIY fix possible

Wait for the boiler to cool down for at least 20 minutesLocate the reset button on the control panelPress and hold the reset button for 2 seconds until the light changesEnsure your radiator valves are open and your central heating pump is running

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Potterton models that show the Overheat - Red LED: FLASHING fault code

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

Source

Potterton Overheat - Red LED: FLASHING fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026