E129 High
Your boiler is starting up but struggling to keep the flame alight, causing it to shut down for safety purposes.
Technical description: Frequent loss of flame (safety error )
Typical repair cost: £120-300 (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 E129 — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Gas valve
- Spark generator
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