BoilerFaultCodesYour boiler's internal temperature sensor has stopped sending the correct information to the control board, preventing the system from operating safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Exchanger probe error – t-sensor damaged, short circuited, sensor damaged or wiring broken
What causes this fault?
This fault occurs when the sensor responsible for monitoring the heat exchanger's temperature fails to communicate with the main control board. The most common reason is that the sensor has physically degraded or developed a short circuit, meaning the boiler can no longer verify if it is operating at a safe temperature. In some cases, the error is caused by loose or damaged wiring connecting the sensor to the brain of the boiler.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like F13 — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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