Cause

Supply Voltage Issue.

Solution

Make sure the supply voltage to the unit is within correct range.

Check the spec sheet to see if the unit is 115V/208V/230V and that the actual supplied voltage +/- 10% of the rated voltage required.

Cause

Fan Defect.

Solution

Check to make sure fan is operating properly.

Cause

Airflow Restriction.

Solution

Make sure coils are clean and unit is properly installed with correct clearances.

Cause

Defective Main PCB, Compressor, or Refrigerant Leak.

Solution

Test Compressor circuit, Check for wiring harness issues. Check output voltage from Main PCB. Look for signs of leak.