12-69 High
Your boiler is struggling to automatically adjust its internal settings to ensure the gas burns efficiently, which may lead to it shutting down for safety.
Technical description: Offset adaptation at limit
Typical repair cost: £120-350 (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 12-69 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation electrode
- Gas valve
- Burner seal
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