E040 High
Your boiler has detected that the water pressure is either too low or the sensor that monitors it is not communicating correctly.
Technical description: Water transducer – check system water pressure
Typical repair cost: £90-180 (including labour)
DIY fix possible
Locate the pressure gauge on the front of the boiler or via the digital screen.If the pressure is below 1 bar, use the filling loop underneath the boiler to carefully top it up to 1.5 bar.Restart the boiler to see if the error clears once the pressure is stable.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E040 — no call-out fees, no surprises.
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Parts commonly replaced
- Water pressure transducer
- Filling loop valves
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