L6 High
Your boiler thinks a flame is burning even though it shouldn't be, causing the system to shut down for safety.
Technical description: False flame lockout
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 L6 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation probe
- Flame sensing electrode
- Printed Circuit Board (PCB)
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