F16 Emergency
Your boiler is still detecting a flame even after it has been told to turn off, which is a safety concern that requires a professional inspection.
Technical description: Flame detection fault (flame presence for more than 5 seconds after burner stopped)
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 F16 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Ionisation probe
- Printed Circuit Board (PCB)
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