There are several reasons why air conditioners don't heat in winter:
1, the temperature setting is unreasonable. It is suggested to set it to 30 degrees, use breeze, seal the room, and properly open the window for ventilation.
2. The filter screen of the internal machine and the condenser of the external machine are too dirty, which affects the heating effect. Just cleaning them.
3. The system pressure is low. The normal heating pressure is 1.6-2. 1MPa. Below this standard, the heating effect is poor. It is suggested to add fluoride in moderation.
It is difficult for air conditioner to work in low ambient temperature.
It is recommended to clean and adjust yourself first. If it still doesn't work normally, you can contact the manufacturer for on-site inspection after sale!