BoilerFaultCodesPotterton Overheat Stat neons flashing Fault Code
Also written as OVERHEATSTATNEONSFLASHING — same fault.
The Potterton Overheat Stat neons flashing fault code means: your boiler has switched itself off because it has reached a temperature that is too high, often caused by a circulation problem or a blockage.. It appears on 1 Potterton model in our database.
Technical description: Overheat thermostat operated or faulty (Section J)
What causes the Potterton Overheat Stat neons flashing fault?
This fault occurs when the water inside the boiler gets too hot, triggering a safety switch to prevent damage. The most common reasons are a pump failure that stops water from moving or a buildup of debris like sludge that blocks the heat exchanger. It can also happen if there is trapped air in the system preventing proper circulation.
This issue often appears when the heating is first turned on after summer, as the internal pump can seize up after long periods of inactivity.
DIY fix possible
Check that your radiator valves are open and not turned to zero.Verify that the system pressure is between 1 and 1.5 bar on the pressure gauge.Allow the boiler to cool down, then press the reset button or turn the selector switch to the 'R' position for at least 5 seconds.
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Gas Safe Register →Potterton models that show the Overheat Stat neons flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Overheat Stat neons 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 27 April 2026