Unit has power but will not start cooling when commanded

Safety: No internal work should be done with power on.

Steps:

• Verify settings: Ensure the unit is set to Cool mode with a temperature at least 2–3°C below room temperature.
• Remote control: Replace batteries, clean the IR window on both remote and indoor unit, and try again.
• Manual operation: Use the emergency/manual button on the indoor unit (if available) to test operation.
• Check timer: Make sure no ON/OFF timer is set that could be preventing operation.
• Technician check: If the indoor fan runs but the outdoor unit never starts, a technician should check the indoor PCB output, communication line, and outdoor PCB.