F13 High
Your boiler's internal temperature sensor is failing to communicate correctly with the main control board, preventing the system from heating up.
Technical description: Exchange probe fault – wiring shorted or wiring broken – check wiring
Typical repair cost: £90-180 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F13 — no call-out fees, no surprises.
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Parts commonly replaced
- NTC Temperature Probe
- Wiring Harness
- Main PCB
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