F.27 High
Your boiler has shut down because it thinks it detected a flame when there shouldn't be one, or the flame signal is being misread.
Technical description: Safety switch-off – fault in flame detection
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 F.27 — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Ignition lead
- Gas valve
- Printed Circuit Board (PCB)
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