BoilerFaultCodesPotterton E15 Fault Code
The Potterton E15 fault code means: your boiler has lost its connection to the gas valve, meaning it cannot safely ignite to provide heating or hot water.. It appears on 4 Potterton models in our database.
Technical description: Gas valve connection fault
What causes the Potterton E15 fault?
This fault occurs when the boiler's main control board loses electrical communication with the gas valve, which acts as the gateway for fuel. The most common reason is a loose or damaged wiring connection between these two parts, or a physical failure of the electronic coil within the gas valve itself. Because the boiler cannot verify that the gas can be turned off or on safely, it shuts down immediately as a safety precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Potterton models that show the E15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E15 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