E 03 Emergency
Your boiler has too much water in the system, causing it to shut down to prevent damage from excessive pressure.
Technical description: High water pressure due to excessive water pressure or safety valve error
Typical repair cost: £100-220 (including labour)
DIY fix possible
Check that the filling loop valves under the boiler are tightly closed.Locate a radiator bleed valve and use a key to release water into a container until the pressure gauge on the boiler drops to 1.5 bar.Restart the boiler to see if the fault clears.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E 03 — no call-out fees, no surprises.
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Parts commonly replaced
- Pressure relief valve
- Expansion vessel
- Filling loop
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