407 High
Your boiler has detected a problem with a temperature sensor, meaning it cannot accurately monitor the heat levels needed to warm your home.
Technical description: Clas HE evoClas he evo systemE-combi evoE-system evo
Typical repair cost: £90-160 (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 407 — no call-out fees, no surprises.
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Parts commonly replaced
- Room sensor
- NTC thermistor
- Wiring harness
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