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The PO error is indicating the compressor discharge temperature is too hot.Could be a restriction in line, outdoor fan not coming on or a bad sensor.
If unit is blowing but no cool air, possibly compressor is off in internal overlaod. Do you have gauges to check operating pressures when this happens?
Quick question.Is the PO on indoor or outdoor unit?
If power is correct, which I am sure it is since it works sometimes, the module is probably the issue causing erractic behavior.
You will probably need to get a Klimaire authorized dealer to determine which of the two is the issue and order the correct part.Otherwise you might get numbers off of board and motor to Google to find.