E9 210 High
Your boiler has shut down because it is detecting dangerously high temperatures in the exhaust flue or a fault with the safety sensor itself.
Technical description: The temperature measured by the flue gas sensor is too high and is open
Typical repair cost: £150-350 (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 E9 210 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue gas sensor
- Heat exchanger cleaning kit
- Main PCB
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