BoilerFaultCodesYour boiler has detected a communication problem with the internal sensor that monitors water leaving the unit, causing it to 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: Interruption flow sensor: check wiring and sensor.
What causes this fault?
This fault occurs when the boiler's main control system loses contact with the sensor that measures the temperature of water leaving the unit. The most common reason is a physical failure of the internal sensor itself or a loose connection in the wiring that carries the signal. Because the boiler can no longer monitor how hot the water is getting, it shuts down to prevent the system from overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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