BoilerFaultCodesYour boiler has stopped working because it cannot correctly measure the temperature of the water returning to the unit.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Return temperature sensor failed
What causes this fault?
This fault occurs when the internal electronic sensor responsible for monitoring the water coming back into the boiler becomes damaged or loses its connection. Over time, heat stress or moisture can cause the sensor to degrade, preventing it from sending a reliable signal to the main control board. Without this vital temperature data, the boiler shuts down as a safety precaution to prevent internal overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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