E35 High
Your boiler's temperature sensor is sending incorrect information to the control board, preventing the system from heating up safely.
Technical description: Flow thermistor fault
Typical repair cost: £100-180 (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 E35 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow thermistor (NTC sensor)
- Wiring harness
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