BoilerFaultCodesPotterton E41 Fault Code
The Potterton E41 fault code means: your boiler has stopped working because one of its internal temperature sensors has developed an electrical fault and can no longer send information to the main control board.. It appears on 1 Potterton model in our database.
Technical description: Return sensor short circuit. Check cable/connections not damaged. Renew sensor/cable. Check connections on control
What causes the Potterton E41 fault?
This fault occurs when the electrical resistance in the return temperature sensor drops to a level that indicates a short circuit, meaning the boiler can no longer monitor the water temperature accurately. The most common reason is internal failure of the sensor's thermistor component, but it can also be caused by water damage or heat degradation affecting the wiring harness.
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 E41 fault code
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Source
Potterton E41 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