I have a GE Weathertron (model 3AAT80 1A1/2A1) that I want to switch over to a Honeywell (RTH6360). Most of the wiring seems straight forward, but ...

R (Weathertron) to R (Honeywell)

O to O/B

G to G

Y to Y

B to ? (i believe C)

T to ?

... and do I need to jump U and W on the Honeywell like the Weathertron does?

Any thoughts are super welcome.


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  • Good for you. You took pictures before taking everything apart. Do the instructions provide a diagram? – JACK Sep 18 at 19:47
  • Can you post photos of the wiring at your air-handler/furnace, and a wiring diagram for that unit for that matter please? – ThreePhaseEel Sep 19 at 0:20
  • To Jack and ThreePhaseEel: 1. Instructions do have a diagram, but it is unclear about B (Weathertron) to C (Honeywell). Also, there is no mention of a T wire and if U needs to be jumped to W. 2. I will add a picture of the the wiring in the wall closest to the air-handler. Looks like spaghetti to me, but hopefully someone can make sense of it. The air-handler is a 1980's GE model and I have not been able to find a wiring diagram. – Bolko Sep 21 at 20:31
  • @Bolko -- the wiring shot you posted appears to be of mains wiring inside a box in the wall, not the thermostat wiring, which will be inside the air handler's own wiring/blower compartment – ThreePhaseEel Sep 22 at 0:14
  • Yes, you are correct the wiring is outside of the air handler. Found schematic (picture added). There is no easy access to view the wiring in the unit. Would require to completely take front and/or side panels off. Hoping that i do not have to do that and that the schematic will work. Appreciate your help on this. – Bolko Sep 22 at 3:46

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