16-64 Emergency
Your boiler has shut down because the exhaust gases are getting too hot, indicating a potential blockage or safety issue in the flue pipe.
Technical description: Flue temperature signals overheating, the flue gas discharge path needs checking, Try resetting the boiler
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 16-64 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue thermistor
- Heat exchanger (cleaning/descale)
- Burner seals
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