Immergas Internal Water Leak

Furnace leaks water from underneath the casing

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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 pump seals, Corroded primary heat exchanger, Faulty automatic air vent, Loose unions or fittings

How to Fix / Troubleshooting

Safety: Isolate power and, if leak is significant, close the heating isolation valves. Water near electrical parts is dangerous.

Steps:

  • 1. Remove front cover: With power off, carefully remove the cover and use a flashlight to locate the source of the leak.
  • 2. Check visible joints: Tighten any slightly loose compression fittings, but do not overtighten.
  • 3. Inspect pump and air vent: Look for water around the circulation pump and automatic air vent. Drips from the vent may indicate it needs replacement.
  • 4. Technician repair: Replace leaking components (pump, heat exchanger, seals) and test system pressure.
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Repair Difficulty

Hard 4/5

Required Part

Circulation Pump or Automatic Air Vent
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