BoilerFaultCodesYour boiler's internal temperature sensor is failing to communicate correctly with the main control board, preventing the system from heating up.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Exchange probe fault – wiring shorted or wiring broken – check wiring
What causes this fault?
This fault occurs when the boiler's internal temperature sensor is unable to send a clear signal back to the main control board. The most common reason is that the sensor itself has worn out and failed, though it can also be caused by loose or damaged wiring that has been disturbed during a recent service or repair.
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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