Medium
32 on Johnson Starley Optima E20

Your boiler has detected a fault with the sensor that monitors hot water temperature, meaning it cannot safely tell how hot your water is.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Domestic hot water temperature sensor short circuit

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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