Ductless AC Troubleshooting, At the outdoor unit...
If there is no ice and the fan is working, you should go to the outdoor unit. If the fan on the outside
unit is not running, you should check the dual run capacitor. Our capacitor testing guide will help
you with that. If the capacitor can is bulging, it is a good indication that it is bad. If the capacitor
is good the condenser fan motor may be bad. You can use our fan replacement guide to help you. If the fan
is running, feel the compressor to see if it is running. If it is hot to the touch and not running, shut
off the power and cool the compressor by pouring water over it. Then, check the outdoor coil and make sure
it is clean. You should also check the dual run capacitor. After the unit is running, you should check the
level. If, after the compressor is cooled down, the unit makes a loud humming noise when it is
trying to start, the compressor rotor may be stuck. You can use a hard start capacitor to try to get it to
run. If the compressor still does not start, it may need to be replaced. You can use our compressor
testing guide to check to be sure. If the fan and compressor are running but the cooling or heating
is insufficient, start by cleaning the unit. Ensure the fan coil, filter, and condenser coil are clean.
Then you can check the refrigerant level and adjust per the operating instructions.
**NOTE** IN SOME COUNTRIES, YOU MUST BE CERTIFIED BY THE GOVERNMENT TO HANDLE
If the unit's refrigerant charge is adequate, the unit may be improperly sized. The only way to tell if
the unit is the proper size is through a process called a load calculation.