Desa Electric Fireplace ,power switch wiring?

Hi All, I have a DESA CEF26-3 electric fireplace that popped a fuse on the main board. Changed the fuse and (fanfare music here) forgot the wiring sequence for the power switch.The downloaded manual shows an black, white and red wire to the switch, the wires I have are black, yellow and orange. When connected, looking at the front of the unit facing the switch , I show the top as being ground, when switch is turned on I have zero resistance on the middle connector, and resistance on the bottom connector.
Can anyone please chime in if they know the wiring sequence? Thank you in advance..