E20 High
Your boiler has detected a fault with the internal sensor that monitors the temperature of your central heating water, causing the system to stop working as a safety precaution.
Technical description: Central heating negative thermistor coefficient (NTC) sensor error
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 E20 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating NTC temperature sensor
- Connecting wiring harness
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