E430 High
Your boiler has detected that the water pressure is too low to operate safely and has temporarily stopped working.
Technical description: Water pressure test
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath your boiler.Open the small valves on the hose slowly until you hear water entering the system.Watch the pressure gauge and close the valves once the needle reaches between 1.0 and 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E430 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop
- Pressure sensor
- Expansion vessel
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