E129 High
Your boiler is struggling to keep a steady flame alight and has failed to automatically adjust itself after several attempts.
Technical description: Safety error for frequently loss of flame with max correction during the ignition during Calibration Function.
Typical repair cost: £120-280 (including labour)
DIY fix possible
Check that your gas meter has credit (if on a pre-payment meter)Ensure other gas appliances in your home, like a hob, are working correctlyPress the Reset button for five seconds to restart the calibration process
Protect yourself from future repair bills
A boiler cover plan would cover faults like E129 — 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
- Flame sensing electrode
- Ignition lead
- Gas valve
*Affiliate links — we may earn a commission at no extra cost to you.