BoilerFaultCodesYour boiler has detected a faulty internal sensor that monitors the temperature of the water returning to the unit, causing it to stop working for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Short circuit on return sen
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring the temperature of the water coming back into the boiler fails or loses its connection. It is usually caused by the sensor's internal electrical circuit failing over time or moisture affecting the wiring, which prevents the boiler from safely calculating how much heat is needed.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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