I have a Trane Heatpump and the old "weathertron" thermostat had wires:

Y
G
O
x2
B
W
R
T

Directions for the new 3100 addresses everything except the "T"

Does anyone know where the "T" wire for the Trane goes on the HW?

thank you,

(Doingitmyself) dimonthecoast

You will not use the T just tape it off. That trane is a old Bay ge thermostat.

God bless you darlin' - I'll be back if it doesn't work - I'm just glad the weather is warm this weekend!

Okay - followed the HW directions - it stated that if the old tstat had both "O" and "B" wires (which mine does) to attach the "B" wire to the "C" terminal, which I did.

It's not working.. .

Did you follow the wire layout as on page 12 of the Honeywell manual Exactly? Have you checked to make sure all power is on the inside/outside unit? Have you checked to make sure you have 24 volts at the thermostat?

I did everything on the HW manual exactly (including using those little white labels), all the power was restored, don't have a volt meter - amateur! Guess I'll have to call the heat and ac guy! I didn't need that $100 bucks after all.

Many times it ends up that way. Without being there my hands are tied to the manual and any old tricks I remember. Here is a older cross over diagram that shows Trane and the GE bay stat. You might look this over to see if any help.

I found that diagram on an earlier thread - it matches what I've done.

I did notice on the old weathertron a saudered link to a "u" from the "w" wire. It wasn't rigged after the fact, but actually part of the manufactured board.

The heat/ac fella comes tomorrow morning - cold weather comes through Wednesday!

Thanks for everything

HVAC1000 - Heat/ac contractor just left - the problem? Seems the builder "wedgeded" my main wire in the wall between the stud and the supporting 2x4 at JUST the place I screwed the new face plate in. The screw penetrated the insulation on the wire and shorted it. $113.96 later and it's fixed.

You may want to put that in your "what's wrong when I've done everything right" file.

The screw in the wire things I just cannot see from here. I am glad at least the wiring was on the thermostat correctly. I will add the screw in the wire thing to my possible solutions.