L6 High
Your boiler thinks a flame is present when it should be off, which is a safety lockout preventing the unit from starting.
Technical description: False flame lockout
Typical repair cost: £120-350 (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
- Flame sensing electrode
- Printed Circuit Board (PCB)
- Gas valve
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