What does the H1 display on the car's heater mean?

1 Answers
VanNadia
07/29/25 9:36pm
When the car's heater displays H1, it indicates the system is defrosting, which means the air conditioning is in defrost mode. During this process, the indoor unit heats while the outdoor unit dissipates cold. Once the temperature reaches a certain level, the condenser of the outdoor unit starts defrosting. At this point, the indoor fan stops, the outdoor fan stops, the compressor operates, and the four-way valve reverses direction to heat the outdoor unit and melt the frost. During defrosting, steam may emerge from the outdoor unit. The car's air conditioning system, commonly referred to as car AC, is designed to regulate and control the temperature, humidity, air cleanliness, and airflow inside the vehicle to optimal levels, providing a comfortable environment for passengers and reducing travel fatigue.
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