L5 High
Your boiler has been manually reset too many times in a short period and has locked itself out to prevent further damage or safety issues.
Technical description: 5 boiler resets in 15 minutes
Typical repair cost: £100-350 (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 L5 — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sense electrode
- Gas valve
- Printed Circuit Board (PCB)
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