E31 High
Your boiler has detected a faulty internal temperature sensor, which means it cannot safely measure the heat of the water and has shut down as a precaution.
Technical description: Flow thermistor short circuit – check/replace connections/thermistor
Typical repair cost: £90-180 (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 E31 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow thermistor (NTC sensor)
- Wiring harness
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