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Hello, the odds that it is a larger problem than just the thermostat are in the 98% range.
Tell me a lot about your electronics skill sets so that I can coach you most appropriately, it will be a2 to 4 hour long session if you have the skills. If you do not have skills in that range tell me which direction you are from the center of the nearest city and I will see if I can find a well rated service outfit in your area.
Thanks, ***** ***** case send me a close up. well lit, and exceedingly well focused picture of the wiring diagram glued to the inside of the blower access door on your furnace. and a photo of the printed circuit card mounted on the blower showing the *thermostat* wire connections. Use the paper clip icon at the right end of your tool bar for that, or the attach files link to the left of your send button.
We can go from there, you will need a multi meter.
Thanks, ***** ***** need a photo of the wiring *diagram (that's a sheet of paper) glued to the inside of the blower access panel.
For now fit a jumper wire between R and Y... if the outside unit runs the problem is with the thermostat or its wiring.
If the outside unit does not run set the thermostat to cooling and down to 60F and measure the voltage between Y and B/C
If you get24v read then the problem is with the outside unit.
Those letters R, Y and C are among the terminal numbers on the printed circuit board that you sent a picture of where the thermostat wires attach.
The two wires that control the outside unit are attached to Y and C
Yes I agree, as I said at the opening the odds that the problem is elsewhere, not in the thermostat, are in the 98% range... had you seen that?
Have you checked for voltage between Y and C as mentioned in my 11:01 remark?
Diagnosis involves doing those tests
Thanks for the pictures, you have your meter set on OHMs not volts, if there was voltage there you can damage the meter by doing that. This is tricky business, the community college training is 2 years, 20 units a semester, then 4 years working under a journeyman...
I am able to offer you a 6 hour training course that will enable you to do those checks correctly without damaging your meter, its a bit arduous and will require some study on your end, or if you want to tell me which direction you are from the center of the nearest city I can locate a well rated service outfit if there is one in the area.
If you are using your meter correctly. (triple check it in a wall receptacle) a zero volt reading between C and Y indicates that the thermostat is not working correctly... you can double check that by fitting a jumper wire from R on the terminal strip to Y on the terminal strip.... if the outside unit comes right away or after 5 minutes, then the thermostat is the problem