E2 351 High
Your boiler has lost its connection to the component that monitors water temperature, meaning it cannot safely heat your home or water until the connection is restored.
Technical description: Flow temperature sensor disconnected
Typical repair cost: £100-£190 (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 E2 351 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow temperature sensor (NTC thermistor)
- Wiring harness / connector
- Control board (PCB)
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