F0 239 High
Your boiler’s internal computer chip has encountered a communication error or technical failure, preventing the system from starting up.
Technical description: The burner control unit KIM (boiler identification module) has an error. Cabling might have poor contact breaks and pinching or the plug and wiring of the burner control unit needs checking, also check the operating characteristics of the boiler by replacing the burner control unit.
Typical repair cost: £180-450 (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 F0 239 — no call-out fees, no surprises.
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Parts commonly replaced
- KIM (Boiler Identification Module)
- Burner Control Unit
- Wiring Harness
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