BoilerFaultCodesYour boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has shut down as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flow or return sensor fault. Short circuit in the flow, return or boiler temperature sensor. Defective or not (properly) connected flow, return or boiler temperature sensor.
What causes this fault?
This fault occurs when the boiler's control board receives an impossible electrical signal from the sensors that monitor water temperature. It is usually caused by a sensor internal component failing due to age or a loose connection in the wiring that prevents the boiler from knowing if the operation is safe. The system shuts down instantly to prevent the unit from overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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