Mitsubishi Electric Loss of Refrigerant Charge / Weak Cooling Circuit

Dehumidifier runs but does not collect water; room remains humid.

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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

Refrigerant leak in evaporator or condenser, micro‑leak at brazed joints, partially blocked capillary tube, inefficient compressor

How to Fix / Troubleshooting

Safety: Unplug the unit. The sealed refrigerant system must only be serviced by certified technicians.

User‑level checks:

  • Operating conditions: Ensure room temperature is above the minimum operating temperature (typically >10°C). Below this, water collection will be poor.
  • Airflow: Clean the air filter and ensure intake/exhaust are unobstructed.
  • Time test: Run the unit for several hours in a closed room. If the compressor runs but the evaporator coil never gets uniformly cool and no water collects, a refrigerant issue is likely.

Technician repair:

  • Leak detection on evaporator, condenser, and joints.
  • Repair of leaks, replacement of filter‑drier if fitted, evacuation, and recharge with the specified Mitsubishi Electric refrigerant type and charge weight.
  • Replace the compressor if it is mechanically weak.
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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Circuit (Evaporator/Condenser/Compressor)
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