128 High
Your boiler started to heat up but the flame went out unexpectedly while it was running.
Technical description: Loss of flame during operation
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your gas pre-pay meter has creditEnsure other gas appliances in your home are working to confirm gas supplyPress the 'Reset' button for five seconds
Protect yourself from future repair bills
A boiler cover plan would cover faults like 128 — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Ignition lead
- Gas valve
*Affiliate links — we may earn a commission at no extra cost to you.