Unit turns on and off frequently (short cycling) without reaching set temperature.

Safety: Unplug the unit before repositioning sensors or opening panels.

Steps:

• Sensor placement: Locate the ambient temperature sensor and ensure it is in the return air stream, not directly in the cold discharge airflow.
• Clean filter and coils: Dirty filters and coils can cause rapid icing and shutdown. Clean thoroughly.
• Check room size: An oversized unit will cool the area near the sensor quickly and shut off, then restart frequently. Consider using a lower fan speed or relocating the unit for better air mixing.
• Control board: If short cycling persists with correct sensor placement and clean filters, the main control PCB may be misreading temperature and require replacement.