12-67 High
Your boiler's flame sensor is detecting an unusual reading that is outside of its normal operating range, which has caused the system to stop as a safety precaution.
Technical description: Ion base value exceeds the upper factory limit – try resetting the boiler
Typical repair cost: £120-280 (including labour)
DIY fix possible
Locate the reset button on the boiler control panelPress and hold the reset button for 2-3 secondsWait for the boiler to complete its restart sequence and check if the code clears
Protect yourself from future repair bills
A boiler cover plan would cover faults like 12-67 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation electrode
- Ignition lead
- Control PCB
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