F.27 High
Your boiler has sensed a flame inside when there shouldn't be one, so it has shut down as a safety precaution.
Technical description: Safety switch off flame simulation
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
- Ionisation electrode
- Ignition lead
- Gas valve
- Printed Circuit Board (PCB)
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