TCL Window AC with Heat – Normal Operation FAQ

Why does my heater stop blowing warm air sometimes?

Your air conditioner may enter an automatic defrost cycle during heating mode. This process melts frost that can form on the outdoor coil in cold weather. Heating pauses temporarily, and the air may feel cooler for a few minutes. Once defrost is complete, the unit automatically resumes normal heating.

Why does the compressor keep running even after the room reaches the set temperature?

Inverter models with heat mode use variable-speed compressor control. Instead of turning off completely, the compressor slows down to maintain temperature and efficiency. It may continue running quietly, which is normal and helps prevent sudden temperature changes.

Why does the outdoor fan stop while heating?

During defrost, the outdoor fan is intentionally turned off so the system can direct heat toward the outdoor coil to remove frost. The fan will restart automatically once the cycle ends.

Why is cool air blowing out while in heat mode?

While the unit is defrosting, the indoor airflow may feel cool or neutral for a short time. This is expected and only lasts a few minutes before normal heating resumes.

Why does the unit turn off and back on by itself?

This is part of normal inverter operation. The system automatically cycles between heating, defrosting, and standby modes to maintain temperature and protect components.

Why does the unit make clicking or whooshing sounds?

You may hear brief sounds when the reversing valve switches the refrigerant direction during defrost. These are harmless and indicate the system is working correctly.

Why does the temperature fluctuate instead of staying constant?

Inverter units continuously adjust compressor speed and fan operation for efficiency. Minor temperature variation is normal and helps reduce energy use while maintaining comfort.

Why is there steam or mist coming from the outdoor unit?

During defrost, warm refrigerant melts frost on the outdoor coil, creating visible water vapor. This looks like steam but is completely normal and not a sign of overheating or smoke.

Summary

The automatic defrost function is a normal feature of TCL inverter window air conditioners with heat. It protects the unit from frost buildup and maintains steady performance in cold weather. The process is automatic, temporary, and requires no user action.