235 High
Your boiler’s internal control parts are speaking different languages because a newer component has been installed that is incompatible with the older system.
Technical description: The KIM (boiler identification module) is too new for the burner control unit
Typical repair cost: £250-550 (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 235 — no call-out fees, no surprises.
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Parts commonly replaced
- Burner Control Unit (UBA)
- KIM Module
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