BoilerFaultCodesPotterton E01 Fault Code
The Potterton E01 fault code means: your boiler has failed to light, which means you will not have any heating or hot water until the issue is resolved.. It appears on 7 Potterton models in our database.
Technical description: Ignition electrode and lead (faulty connection, spark gap or position), igniter failure, or gas supply issues.
What causes the Potterton E01 fault?
This fault occurs when the boiler's control board attempts to start the burner but fails to detect a flame after several attempts. The most common reasons are a lack of gas reaching the unit, a worn-out ignition spark that can no longer light the fuel, or a dirty internal sensor that cannot see the flame even if it has successfully lit.
This fault is frequently seen during extreme cold snaps, as external gas regulators can freeze or condensation pipes can block, preventing the ignition process from completing.
DIY fix possible
Check that your gas meter has credit and the gas emergency control valve is open.Verify that other gas appliances in your home, such as a hob, are working.Press and hold the 'R' (Reset) button for at least 2 seconds to see if the boiler restarts.
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Gas Safe Register →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 27 April 2026