BoilerFaultCodesPotterton E10 Fault Code
The Potterton E10 fault code means: your boiler has stopped working because the water pressure in the central heating system is too low.. It appears on 11 Potterton models in our database.
Technical description: CH system pressure less than 0.5 bar or faulty water pressure switch.
What causes the Potterton E10 fault?
This fault occurs when there isn't enough water circulating through your pipes and radiators to allow the boiler to operate safely. The most common reason is a slow leak somewhere in the system or because you recently bled your radiators, which lowers the overall pressure. In some cases, the internal expansion vessel may have lost its charge, causing water to escape through the safety valve.
This fault is more common in autumn when homeowners turn their heating back on for the first time after summer, revealing pressure losses that occurred while the system was idle.
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Open the black taps on the filling loop slowly until you hear water flowing.Close both taps tightly once the pressure gauge on the boiler reaches between 1.0 and 1.5 bar.
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Gas Safe Register →Potterton models that show the E10 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E10 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