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I've run across several of them that had either RTV or Dielectric grease on every electrical connection.

For those interested here is the procedure to get the board out of the inverter. Remove all the perimeter screws from the top panel and remove the panel. Top panel removed. Remove all the perimeter screws from the side panel and remove. There is some sticky foam tape by the connector...

Ray, The OL/SC moisture problem has to do with the main control board in the 831A's inverter. The main board is covered with potentiometers that are adjusted when the inverter is tuned at the factory. TRC decided to NOT seal the potentiometers after the inverter was finished. The problem...

Ray, The inverters in the 831's are fussy about high humidity and will throw OL/SC faults due to it. Will do a lengthy write up tomorrow on info I have about it and what looks like a promising solution. Kurt

The inverter itself senses and determines if there is an Overload/Short Circuit OL/SC) situation. The K8 OL/SC fault relay is inside the inverter. On the surface it might appear that your inverter has gone south.