My air conditioner belongs to Gree. It doesn't blow hot air. Blow for a while after starting, and then start blowing cold air. What happened?

There are several possibilities: first,

Insufficient refrigerant and low pressure.

two

Electric heating is not started or damaged. three

The system is dirty or blocked by ice (this is unlikely to happen if the machine is not moving). four

The filter screen of the internal machine is dirty or the evaporator is dirty, which needs cleaning.

The one upstairs is suspected of cheating. You mean this is normal? Gree 20 12 spent10 billion on this product? Joke! ! If my air conditioner is like this, Gree's after-sales staff will explain it to me and I will return it directly! ! Midea Zhigao Haier has no vortex airflow? Why is there Gree?