FA 306 Emergency
Your boiler is still detecting a flame even though the gas supply should have been cut off, which is a safety concern that prevents the unit from operating.
Technical description: Ionisation detected after the gas valve closed
Typical repair cost: £120-450 (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 FA 306 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Flame sensing electrode
- Printed Circuit Board (PCB)
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