Hi Mikerho,

On searching I found this similar drawing, is a thermistor, and another drawing this time with the short horizontal line at the bottom-left, is a Varistor.

It would make sense to combine these as a surge protection perhaps only accepting current from the electronics to the Motor and restricting current in the other direction. This may be pretty blooming obvious to you electronic experts and I do understand it. But my reading of the schematic is not at all good.

but, I cannot recall what a thermistor-varistor combination is called. Hope this makes sense.

Take care

A transducer which converts temperature (heat) to resistance (an electrical property).