43 High
Your boiler has lost the signal that confirms a flame is burning, so it has shut down for safety.
Technical description: Loss of flame rectification
Typical repair cost: £120-280 (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 43 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation probe
- Flame sensing electrode
- Ignition lead
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