BoilerFaultCodesPotterton E08 Fault Code
The Potterton E08 fault code means: your boiler has detected a fault with the temperature sensor for your hot water, which means it cannot safely heat the water for your taps.. It appears on 1 Potterton model in our database.
Technical description: DHW sensor short circuit. Check cable/connections not damaged. Renew DHW cable/sensor assy. Part No. 5106290
What causes the Potterton E08 fault?
This fault occurs when the electrical circuit for the hot water temperature sensor is interrupted, usually by water ingress or internal component failure. The most common reason is that the sensor's internal insulation has broken down or the connecting wires have become pinched or corroded, leading to an incorrect electrical signal. Because the boiler can no longer monitor how hot the water is, it shuts down as a safety precaution to prevent scalding.
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 E08 fault code
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Source
Potterton E08 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