Worcester Chronic Pressure Loss

Boiler frequently loses pressure, pressure gauge drops to zero over hours or days, requiring regular top-ups.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Leaking Worcester pressure relief valve, failed expansion vessel, hidden leak in pipework or radiators, micro-leaks at joints

How to Fix / Troubleshooting

Safety first: Do not over-pressurise the system; keep below the maximum indicated on the gauge (usually 3 bar).

Homeowner checks:

  • Top up pressure to 1.2–1.5 bar and monitor over 24–48 hours.
  • Inspect the pressure relief valve discharge pipe outside; if water drips when the boiler runs, the PRV may be passing.
  • Check visible pipework and radiator valves for signs of damp or staining.

Engineer actions:

  • Test and recharge the expansion vessel to the correct pre-charge; replace if the diaphragm has failed.
  • Replace the Worcester pressure relief valve if it is not sealing properly.
  • Use leak detection methods to locate hidden leaks in the system.

Repeated topping up introduces fresh oxygen and accelerates corrosion; the root cause must be fixed.

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Repair Difficulty

Hard 4/5

Required Part

Expansion Vessel
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