F09 – A09 High
Your boiler has sensed it is getting much too hot and has shut itself down to prevent damage or dangerous overheating.
Technical description: Overtemperature protection intervention
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 F09 – A09 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Overheated limit thermostat
- Heat exchanger cleaning
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