Immergas Chronic Pressure Loss / Leak

System pressure drops over time, requiring frequent topping up

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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

Hidden leak in heating circuit, Leaking pressure relief valve, Micro-leak inside boiler (heat exchanger, pump seals)

How to Fix / Troubleshooting

Safety: Do not overfill the system; excessive pressure can cause further leaks.

Steps:

  • 1. Inspect visible pipework: Look for damp patches, staining, or green corrosion on joints and radiators.
  • 2. Check PRV discharge: Observe the pressure relief valve discharge pipe outside; if it drips when the boiler is off, the valve may be passing.
  • 3. Check inside boiler: With the cover off, look for signs of dried water marks or rust.
  • 4. Technician tasks: Perform a pressure test on the system, replace leaking components, and replace the PRV if necessary.
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Repair Difficulty

Medium 3/5

Required Part

Pressure Relief Valve
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