Hi, sounds to me ur compressor is not runnig it probably overheated, turn off the ptac and let it sit for an hour or so then try to restart it
I unpluged all the units for over an hour and then pluged them back in and I still do not get enough hot air. The fan seems to blowing enough air, but it is just not as warm as it use to be.
Hvac tech and Mechanic
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.