E28 High
Your boiler has detected a problem with the internal sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.
Technical description: Flue negative temperature coefficient (NTC) thermostat 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 E28 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue NTC sensor
- Wiring harness
- Printed Circuit Board (PCB)
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