E9 277 High
Your boiler has shut down because it has detected internal water temperatures that are dangerously high, likely due to a circulation or sensor issue.
Technical description: The safety temperature sensor has measured temperature in excess of 95°c
Typical repair cost: £180-350 (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 277 — no call-out fees, no surprises.
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Parts commonly replaced
- Safety temperature sensor
- Circulation pump
- Main heat exchanger
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