Here's some info the OP sent me:
###This is the most frustrating thing I have seen. I am going to test the coil today and there is also a test for the voltage regulator. I am not sure about the control board.
The Model Number is 2.8KVFA26100K Spec K Serial - G040668830
Do you know if there is any way to test the Control Panel? It seems to run find but something is getting hot and shutting the system down. Also, I have had people comment on the low oil sensor switch mounted in the oil pan. Whew! What a pain in the neck.###
On every modification, ONAN increments the Spec Code. We have the 4KY and it's also up to Spec "K." In the case of the 4KY, that Oil Sensor had been discontinued by the time they got to "K" which illustrates why the hard core genny guys want the Spec. No need to chase a feature that isn't there anymore. Or ignore a new or modified feature.
OP - you may want to click "notify moderator" and ask it to be moved to Tech Issues. Several genny guys hang out there.