A04 Emergency
Your boiler has shut down because it has detected a recurring issue with how it is getting rid of waste gases.
Technical description: Flue gas fault – could be because F07 happened 3 times in the last 24 hours – check the flue
Typical repair cost: £100-280 (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 A04 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue pressure switch
- Fan
- Flue seals
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