Mitsubishi Electric
Defrost System Inefficiency
Frost or ice builds up on the evaporator coil and does not melt during normal operation.
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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
Faulty evaporator temperature sensor, low ambient temperature, restricted airflow, low refrigerant charge, defrost control issue on PCB
How to Fix / Troubleshooting
Safety: Unplug the unit before defrosting. Do not chip ice with sharp tools.
Steps:
- Manual defrost: Leave the unit unplugged with covers open until all ice melts. Place towels underneath.
- Airflow: Clean the air filter and ensure intake/exhaust are unobstructed.
- Room temperature: Use the unit only within the specified temperature range. In very cold rooms, move the unit to a warmer area.
- Sensor/PCB (technician): Test the evaporator temperature sensor and replace if out of spec. If sensor is good, the main control PCB defrost logic may be faulty.
- Refrigerant: If icing recurs quickly, a technician should check for low refrigerant or system imbalance.
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Repair Difficulty
Hard
4/5
Required Part
Evaporator Temperature Sensor
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