Today, a van turned on the air conditioner and the heating failed, and then an ultra-fine product made a switch I didn't know, and only the air conditioner was turned on.

Hello, this is a control valve. Just like a faucet, it won't turn off. It will go through the water when it is turned on. The incoming water passes through the hot air tank, and the fan is operated to blow hot air. Generally speaking, warm air is hot and cold. Just touch the hose. If one end is hot and the other end is not, the switch is broken. If both ends are hot and cold wind is blowing, it may be that the warm air slot is blocked or the refrigeration and air conditioning is not turned off. These are some of the simplest mistakes. Wish you a happy life!