Carrier
Loss of Cooling / Reversing Valve or Refrigerant Issue
Carrier air conditioner blows warm air in cooling mode
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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, Reversing valve stuck in heating position (heat pump models), Compressor not running, Indoor and outdoor fans running without refrigeration
How to Fix / Troubleshooting
Safety: Turn OFF power before opening panels. Refrigerant work must be done by certified technicians.
- Step 1 – Check mode and setpoint: Confirm the unit is set to COOL and the set temperature is below room temperature.
- Step 2 – Check outdoor unit: Ensure the outdoor fan and compressor are running. If only the fan runs, the compressor may be off due to a fault.
- Step 3 – Filter and coils: Clean filters and coils to ensure proper heat transfer.
- Step 4 – Technician service: If air remains warm, a Carrier technician should check refrigerant charge, compressor operation, and reversing valve function.
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Repair Difficulty
Hard
4/5
Required Part
4-Way Reversing Valve
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