BoilerFaultCodesPotterton Burner Neon (Flashing) Fault Code
Also written as BURNERNEONFLASHING — same fault.
The Potterton Burner Neon (Flashing) fault code means: your boiler has become too hot and has automatically shut down as a safety precaution.. It appears on 1 Potterton model in our database.
Technical description: Indicates the overheat thermostat has operated. Fault will be rectified by allowing the boiler to cool and turning the selector switch to the reset position.
What causes the Potterton Burner Neon (Flashing) fault?
This fault occurs when the water inside the boiler exceeds a safe temperature, causing the system to shut down to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the heat exchanger that restricts flow. It can also be caused by a faulty internal sensor that is incorrectly reporting the temperature.
This fault is frequently seen when the heating is first turned on after summer, as the internal pump can often seize or stick during long periods of inactivity.
DIY fix possible
Wait at least 30 minutes for the boiler to cool down completely.Turn the main selector switch to the 'Reset' position and hold for 5 seconds.Turn the switch back to the 'On' position and check if the burner reignites.Ensure all radiator valves are open and the system pressure is between 1 and 1.5 bar.
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Gas Safe Register →Potterton models that show the Burner Neon (Flashing) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Burner Neon (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