I'm not suggesting you do this, but if my KOMOS was misbehaving this is what I would do.
Unplug from the wall. Remove the cover of the circuit board and disconnect any wire harness connectors from the board and put them back on to rule out an intermittent connection problem at the terminals. If that fails....
Then I would start bypassing components that are not critical to the operation of the compressor. In the picture below, the first relatively easy test is to jump a connection between the incoming brown 120v "hot" and the "C" contact on the compressor as shown by the red drawn-in line. I'm not sure if the wire is still red between the overload switch and the compressor but you should be able to trace the wires. This would bypass both the controller and the overload switch. If the thing runs normally, you can isolate the overload protector by move the connection back to before the overload. If it stops working, you know it's the overload switch. If neither works, I would test the PTC starter by momentarily jumping across the two remaining terminals on the compressor. This essentially engages the startup winding of the motor (which is what the PTC Starter's function is). Keep in mind that I haven't gotten my hands into my own Komos so I'm not sure if the PTC starter is a separate module or if it's plugged ON to the three terminals of the compressor body. If you can figure it out, you can also remove the PTC module and test the resistance between the two terminals. If it's several hundred ohms or more, that's a likely problem.
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