Sure enough the literature is almost always right. The literature does state Inverter/compressor internal fault. As stated above, also stated is overcharged system, phase imbalance/compressor or inverter miswire, flooded start, inverter damage, or compressor damage. But if the compressor isn’t starting, then you can’t check the charge. So lets focus on the inverter and compressor for this discussion. Maybe we’ll all learn something new.

You start thinking maybe the inverter is bad, or maybe the compressor is bad. First you can confirm that the MOC board is good. Ohm out the MOC board across A and B , you should get a good reading between 27K and 32 K ohms. Also the DC voltage on A & B should be around 3 vdc depending on incoming line voltage to the unit.

Then you ohm out the compressor wires from the inverter terminals U(YEL,), V (RES), and W (BLK). . You slide them off, ohm out and you begin getting some odd readings. You should get a stable, equal reading from the chart below, depending on which compressor tonnage you have. You should measure the resistance to ground from each lead. You shouldn’t get anything to ground.