BoilerFaultCodesYour boiler's internal temperature sensor has stopped communicating correctly, preventing the system from heating your radiators.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Central heating NTC error
What causes this fault?
This fault occurs when the boiler's control board loses communication with the temperature sensor responsible for your radiators. This is typically caused by the internal sensor failing due to age or a loose electrical connection in the wiring harness that prevents the boiler from monitoring how hot the water is.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like E20 — no call-out fees, no surprises.
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