Replacing the aging capacitor eliminates frequent start-stop issues, making the compressor run more smoothly. The new mainboard accurately controls the airflow temperature, reducing room temperature fluctuations and making it feel more comfortable. Replacing burned-out circuit components stops the air conditioner from showing error lights and failing when restarted. The new mainboard optimizes the fan speed logic, providing consistent airflow from the vents without sudden changes. Replacing the faulty relay restores the timed on/off function, making it easier to set up night-time schedules for sleep., Manufacturer: Zhangfu0822