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Please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of thetool bar at the top of this dialog box to attach it here. ,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If there is no paper clip-icon, look for the '+attach files' link at left of your send button.
I can mark it up with wiring instructions.
Hello again, it looks like the Black and red were the original power connections, nothing else is unattached. It is a bit of a risk. I can't recommend it. But some people would connect those two wires to 120 volts for one second and see what happens.
Hello again, without a diagram for the furnace, I suppose the thermostat is wired in series with the 120v power to the Red and Black wires. But first we need to see if 120v directly to the red and black wires runs the heater or not.
If it does, then either the red or the black goes through a line voltage thermostat on its way to the heater.
Set the thermostat on heat then put power to the red and black for 1 second, if it does not short out, try it for a longer period, if the furnace operates you have solved the problem.
If not, we can go way way off into the very tall weeds and attempt to figure out what the heck is going on without a diagram.
But first we need to do that test.
Hello again, I said Red and Black... look to be disconnected.
"it looks like the Black and red were the original power connections, nothing else is unattached. It is a bit of a risk. I can't recommend it. But some people would connect those two wires to 120 volts for one second and see what happens."
You would not connect them to anything on the unit.... you would run 120v to them as a brief test only.
You are undoubtedly 100% correct, if the thermostat is not connected it will not run.,, but that is something we can look into *later.
The wiring is completely messed up, and you do not have a wiring diagram... its a risky situation, do any tests at your own risk, and cautiously. ONE step at a time... not two or three steps at a time... just step at a time.