Senville Dual Zone Mini Split air handlers on but compressor not turning on

I have this system hooked up to my travel trailer. It has been working great until a few days ago. I had the A/C on and all of a sudden hot air started blowing out of the only air handler I had turned on. I went outside and the condenser fan was not on. This is the first time I've had this happen.

I live just outside Phoenix, AZ so the temperature is pretty hot (110+ degrees). I went into the back room of the trailer to turn the other air handler on and the condenser fan turned on and the air handlers started blowing cool again (not quite as cold as it used to though).

I'm not getting an error code on the air handlers, the unit clearly has power because the air handlers are staying on along with their fans when this happens, but there is something causing the compressor to not turn on or turn off shortly after I turn one of/both of the air handlers on?

Since I'm not getting an error code and the unit has power, I don't know what else to check? The manual does not include this problem in the troubleshooting section

Any help in figuring out what is going on would be greatly appreciated!

source https://hvac-talk.com/vbb/threads/2240803-Senville-Dual-Zone-Mini-Split-air-handlers-on-but-compressor-not-turning-on?goto=newpost