De Dietrich Internal Water Leak

Furnace is leaking water from the bottom of 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 plate heat exchanger on De Dietrich combi boiler, Dripping safety valve, Corroded hydraulic block, Loose union on flow/return connections

How to Fix / Troubleshooting

Safety: Switch off power. If the leak is significant, close the isolation valves and protect surrounding areas from water damage.

Steps:

  • Identify source: Remove the front panel and trace the leak to its origin (heat exchanger, valve, joint).
  • Check pressure: If the safety valve is dripping and pressure is high, reduce system pressure to the recommended level.
  • Tighten unions: Gently tighten accessible compression or union fittings if they are visibly loose. Do not overtighten.

Professional help: Component replacement (heat exchanger, hydraulic block, safety valve) should be done by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Plate Heat Exchanger
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