Replacing Thermostat Wiring! Single mom here!


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Old 06-02-14, 12:10 AM
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Question Replacing Thermostat Wiring! Single mom here!

Hey all - I am trying to replace my old Weathertron thermostat with a new Honeywell thermostat. I have a heat pump with aux/emergency heat. I've taken photos of everything I can think of.

I can't figure out the wiring

Weathertron has: according to the old t-stat

W
G
Y
T
R
B

New Honeywell RTH3100C for Heat Pumps has:

E
AUX
Y
G
O
L
R
B
C

I'm a single mom, my home was built by Habitat for Humanity in 2005 - the heat pump is a Trane. I've been googling this for hours now and pretty frustrated.

Any thoughts? Thank you so much!
 
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Old 06-02-14, 06:08 AM
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Trane=Honeywell
W= Aux and E
Y = Y
B = C
G =G
R = Rc and R
O=O (you didn't list this but your new stat is for heat pumps)
Tape off the old T wire.
 
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Old 06-02-14, 06:26 AM
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Here is a photo of the wall wires.

System is from 2005 but I suspect the t-stat is from before then. Habitat is famous for building spare parts houses.

The "T" wire is orange. Could T = O ?
 
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Old 06-02-14, 08:47 AM
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Ok - I figured out the wiring problem. I had to remove the old thermostat with... Force. I scraped off the O label from the plastic. There was never a T wire, it was the O wire all along.

This opens up a whole new can of worms though. I wired it all up and still nothing. I took the wire panel off the heat pump and saw a "5" orange automotive fuse blown. It was between the board and another device.

I think I may just need to replace this automotive looking fuse and I'll be good to go.

Thoughts? thank you!
 
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Old 06-02-14, 09:54 AM
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Yea if that fuse is blown nothing is going to happen. You can get them at any auto supply, I would buy 2 fuses, you never know.
 
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Old 06-02-14, 01:23 PM
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Posters often mistakenly connect Trane B to Honeywell B. This will pop the fuse. Trane's B is Honeywell's C. (24 volt common)

Forgetting to remove power to the air handler before replacing a thermostat can also pop a fuse.
 
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Old 06-02-14, 08:55 PM
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Thank you so much for all the help! My heat pump is humming away nicely! We are cool as cucumbers!

This forum is my new best friend!
 
 

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