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 error
What causes this fault?
This fault occurs when the boiler's internal computer loses communication with the sensor that monitors water coming back from your radiators. The most common reason is that the sensor has electronically failed or developed a loose connection, preventing the boiler from knowing if it is safe to continue heating. Without this data, the system 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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