E9 318 High
Your boiler has detected that the connection to the sensor monitoring exhaust fumes has been broken or lost, causing the system to shut down for safety.
Technical description: The flue gas temperature sensor contacts have been interrupted
Typical repair cost: £120-£220 (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 318 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue gas temperature sensor
- Wiring harness connector
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