BoilerFaultCodesPotterton Pump/Low Pressure Neon Fault Code
Also written as PUMPLOWPRESSURENEON — same fault.
The Potterton Pump/Low Pressure Neon fault code means: your boiler has stopped working because there is not enough water pressure in the system or the internal pump cannot move water around your radiators.. It appears on 1 Potterton model in our database.
Technical description: Illuminates if the circulating pump is faulty or the system pressure drops below the minimum requirement.
What causes the Potterton Pump/Low Pressure Neon fault?
This fault occurs when the boiler detects that there is either insufficient water volume to operate safely or that the water isn't being pushed through the pipes. The most common reason is a simple drop in system pressure due to a small leak or recently bled radiators, but it can also be caused by a mechanical failure of the internal pump. Without enough pressure or flow, the boiler shuts down to prevent the heat exchanger from overheating.
This issue often surfaces in autumn when the heating is turned on for the first time after summer, as the pump can seize during long periods of inactivity.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should ideally be between 1 and 1.5 bar.If the pressure is low, locate the filling loop (a flexible silver hose) under the boiler and slowly open the valves until the needle reaches 1 bar.Turn the selector switch to the reset position for five seconds, then back to the heating or hot water position.
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Gas Safe Register →Potterton models that show the Pump/Low Pressure Neon fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Pump/Low Pressure Neon 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