E9 220 High
Your boiler has detected an unsafe level of heat or an electrical fault in its safety sensor and has locked down to prevent damage.
Technical description: The contacts for the safety temperature sensor have shorted or the safety temperature sensor has detected a temperature higher than 130°c
Typical repair cost: £140-£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 220 — no call-out fees, no surprises.
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Parts commonly replaced
- Safety Temperature Sensor
- Heat Exchanger Overheat Stat
- Wiring Harness
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