BoilerFaultCodesPotterton Low System Pressure light Fault Code
Also written as LOWSYSTEMPRESSURELIGHT — same fault.
The Potterton Low System Pressure light fault code means: your boiler has lost the water pressure it needs to circulate heat, so it has safely shut itself down until the system is topped back up.. It appears on 1 Potterton model in our database.
Technical description: The central heating system looses pressure for any reason and the appliance will cease to function.
DIY fix possible
Locate the filling loop (a silver flexi-hose) beneath the boiler.Open the valves on the filling loop to allow water into the system until the pressure gauge reads between 1 and 1.5 bar.Close the valves tightly and turn the boiler off and on again to reset.
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Potterton models that show the Low System Pressure light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Low System Pressure light 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