BoilerFaultCodesPotterton E01 Fault Code
The Potterton E01 fault code means: your boiler has tried to light several times but has failed to create a flame, causing the system to shut down for safety.. It appears on 2 Potterton models in our database.
Technical description: Primary pressure too high. Reduce CH system pressure. Check/adjust/replace primary expansion vessel 5106287
What causes the Potterton E01 fault?
This fault occurs when the boiler's control system attempts to start the combustion process but cannot detect a stable flame. The most common reasons include a worn-out ignition spark, a blockage in the gas supply, or an internal component failing to open the gas valve correctly.
This issue is more frequent during particularly cold spells when high demand on the gas network or a frozen condensate pipe can prevent the boiler from lighting successfully.
DIY fix possible
Check if other gas appliances, like a hob, are working to confirm gas supply.If you have a prepaid gas meter, ensure it has credit.Press and hold the 'Reset' button for five seconds to attempt a restart.
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A cover plan would handle faults like E01: no call-out fees, no surprise bills.
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Potterton models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E01 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