Unit powers on but compressor does not start; only the fan runs and air is not cold.

Safety: Compressor circuits carry high voltage and can store energy in capacitors. Unplug the unit and discharge capacitors before testing.

Steps:

• Listen for sounds: When cooling is selected, listen for a humming or clicking from the compressor. Repeated clicking without start suggests a start issue.
• Check voltage: Ensure the outlet voltage is within the specified range.
• Inspect capacitor: Access the electrical compartment and locate the compressor run capacitor. If it is bulged, cracked, or leaking oil, replace it with an identical µF and voltage rating.
• Test run after replacement: Reassemble, restore power, and test cooling.

If the compressor still does not start, it may be mechanically locked or the control board relay may be faulty. These conditions require professional diagnosis and often major repair or replacement.