12-64 High
Your boiler is having trouble managing the flame correctly and has locked itself for safety after failing to stabilise.
Technical description: Ion control deviation is too big – try resetting the boiler
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Locate the reset button on your boiler's control panelPress and hold the reset button for at least 5 secondsWait for the boiler to attempt to restart; if the code returns immediately, call a Gas Safe engineer
Protect yourself from future repair bills
A boiler cover plan would cover faults like 12-64 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Ionisation electrode
- Ignition lead
- Gas valve
- PCB
*Affiliate links — we may earn a commission at no extra cost to you.