Not sure about the old thermostat working without batteries. They’ve always been in there I guess. Old Thermostat btw is the current one as I hooked it back up since I couldn’t get the Wyze working.
Now I’d like to look at the control board wiring at the air handler, but it’s in the attic and Im worried it’s a bit over my pay grade. If I’m mentioned it a few times I’m not handy and bad at do it yourself projects although I get by.
I guess I can just open the big panel where what looks like power wires go in at the air handler to see the control board?
I’m kind of reticent to do anything in the short term as we’ve had a cold snap and not having heat would be a big problem currently should I mess anything up. I did find the air handler manual in the attic. It shows 3 types of wiring. Single speed cooling 2 stage heat, single cooling 1 stage heat, and heat pump. Obviously I have a heat pump so you’d think that would be the one, but it’s wiring diagram in the manual doesnt match mine at the thermostat. Nor does 1 cool 1 heat wiring. The 1 cool 2 heat wiring most closely matches mine (at the thermostat), it shows W2, W1, G, Y, RC and RH jumpered together. Total of 5 wires where I have 6.
The single cooling 1 stage heat wiring diagram shows just 4 wires at the thermostat ( W, G, Y, R) and the heat pump diagram shows 8 (F, B, X2, W, T, G, O, Y ,R). So these dont seem to come close to the actual wiring at my Thermo.
I believe it’s an American Standard (Trane?) Air handler if that matters. Model TWE-IN-2A. It’s a Goodman heat pump unit I believe
I found the manual online and here are the wiring layouts I referred too
