BoilerFaultCodesTechnical description
Water temperature sensor fault (open or short circuit)
What causes this fault?
This fault occurs when the boiler's internal computer loses communication with the sensor that monitors water temperature. This is usually caused by the sensor failing due to age or internal wear, though it can also happen if the electrical wires connecting the sensor to the main control board have become loose or damaged.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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