Generally, the refrigeration is normal, and the heating is basically no problem, at least the system is absolutely no problem.

Now let me analyze the possible electrical faults:

If the hot air is blown out in the process of starting once after heating, and then it is not started, it may be that the indoor ambient temperature sensor or the motherboard is faulty.

If you switch to the process of starting once after heating, and there is no hot air blowing out when working outdoors, then don't start it again. It may be that the inner coil sensor is faulty or the related circuit or connection is faulty.