E23 High
Your boiler has stopped working because it cannot correctly detect the water pressure, often due to a low water level or a faulty sensor.
Technical description: Water filling error – check water pressure sensor
Typical repair cost: £120-220 (including labour)
DIY fix possible
Check the pressure gauge on the front of the boilerIf the pressure is below 1 bar, use the filling loop to top it up to 1.5 barReset the boiler by pressing the 'Reset' button
Protect yourself from future repair bills
A boiler cover plan would cover faults like E23 — no call-out fees, no surprises.
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Parts commonly replaced
- Water pressure sensor
- Pressure switch
- Wiring harness
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