BoilerFaultCodesTechnical description
Short circuit: Return sensor - Return temperature sensor defective or has short-circuited
What causes this fault?
This fault occurs when the boiler's control board detects an incorrect electrical signal from the sensor that monitors water temperature coming back from your radiators. The most common reason is that the sensor's internal components have failed or the wiring connecting it to the main board has become damaged or loose. Because the boiler can no longer safely track how hot the water is, it shuts down to prevent overheating.
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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