BoilerFaultCodesYour boiler has detected that a internal sensor responsible for measuring water temperature has stopped working correctly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault with the temperature sensor
What causes this fault?
This fault occurs when the boiler's internal computer can no longer receive a reliable reading from the sensor that monitors water temperature. The most common reason is that the sensor has physically failed due to age or wear, but it can also be triggered by loose or corroded electrical connections between the sensor and the main control board.
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.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like A1 — no call-out fees, no surprises.
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