Thermoking evolution APU

My thermoking apu will come on for a few min and then just shutoff without any error codes on the display, how ever if I have my ac running it will do the same run for a bit blow cold air and then shut off, then the little snowflake will start flashing again and the display will shutoff and I cant turn on the display for a few min and when it does it just goes back to standby mod