BoilerFaultCodesYour boiler has lost connection with a internal sensor that monitors water temperature, meaning it cannot safely heat your home until the connection is restored.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The flow temperature sensor contacts have been interrupted
What causes this fault?
This fault occurs when the boiler's main control board loses electrical contact with the sensor that monitors the temperature of the water leaving the unit. The most common reason is a physical failure of the internal sensor's sensitive components or a loose connection in the wiring harness caused by natural heat expansion and vibration over time.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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