E20 High
Your boiler has lost its ability to accurately measure the temperature of the water used to heat your radiators, meaning your heating will likely stop working.
Technical description: Central heating negative temperature coefficient (NTC) fault
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 E20 — no call-out fees, no surprises.
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Parts commonly replaced
- Central Heating NTC Sensor
- Sensor Wiring Harness
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