E28 High
Your boiler has detected a problem safely discharging exhaust gases or removing waste water, causing it to shut down for safety.
Technical description: Error with the NTC (Negative Temperature Coefficient) flue, air pressure switch or blocked flue or condensate
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check the external plastic condensate pipe for signs of freezing or blockageGently pour warm water over the external pipe if it is frozenEnsure the external flue terminal on your wall is not obstructed by debris or plantsReset the boiler once by turning the selector knob to 'R' for five seconds
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
- Air Pressure Switch
- Condensate Trap
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