SOLVED: No power getting to the thermostat

rejesterd wrote:

Old-Biscuit wrote:
Connect the 2 blue wires togther.furnace should come on
Connect the blue wire (one from furnace on/off switch) to Yellow wire and A/C Unit should come on

BFL13 wrote:
you can confirm the furnace works down at the furnace by jumpering the blues that would go to the tstat (but somehow get to the red and white on yours I think)

Ok, I'm slowly getting this. I've actually looked at the manual Old-Biscuit linked before, but I don't have 2 blue wires. Here's the thermostat wiring.



So there's one of each: blue, red, white, yellow, gray, and green. It's hard to see from the picture, but there is also another red wire inside the wall that is connected to another very small gauge red wire with a wire nut. Neither of these appear to be connected to the thermostat. Also, there are 2 purple wires coming from the thermostat that have been cut and taped over. I haven't done anything to the wiring here, so this is the way it's been for years (and the system has worked generally well for the most part).

Based on what I'm reading in the manual, it seems that if I connect red to green or red to gray, that should operate the fan only. And connecting red to yellow & green, that would operate the AC at low speed. And connecting red to white would run the furnace.

Is that correct? Thanks so much.