BoilerFaultCodesYour boiler has detected a fault with its temperature sensor, which means it cannot tell how hot the water is getting 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: Appears if a problem exists with the primary thermistor.
What causes this fault?
This fault occurs when the boiler's internal thermometer, known as a thermistor, stops sending a reliable reading to the main control board. The most common reason is that the sensor has physically failed due to age or internal wear, though loose or damaged wiring between the sensor and the circuit board can also break the signal.
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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