Panasonic Loss of Cooling Capacity

Indoor unit runs but no cooling; air coming out is room temperature or only slightly cooler.

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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

Low refrigerant charge due to leak, Dirty indoor or outdoor coil, Faulty electronic expansion valve, Compressor not running or short cycling

How to Fix / Troubleshooting

Safety first: Turn off power before cleaning. Refrigerant work must be done by a licensed technician.

Steps for homeowner:

  • 1. Clean indoor filters: Remove and wash filters with mild detergent, dry completely, and reinstall.
  • 2. Clean indoor coil surface: With power OFF, gently vacuum dust from the coil fins behind the filters.
  • 3. Check outdoor unit: Ensure the fan is running when cooling is selected and that the coil is not blocked by dirt or objects.
  • 4. Observe compressor: Listen at the outdoor unit; if the fan runs but there is no compressor sound or it starts and stops quickly, there may be a refrigerant or compressor issue.

If cleaning and airflow checks do not restore cooling, contact a technician to check refrigerant charge, compressor operation, and the Panasonic electronic expansion valve.

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Repair Difficulty

Hard 4/5

Required Part

Electronic Expansion Valve
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