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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Wow that impressive, i have a trans heat pump and I'm trying

Customer Question

wow that impressive
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: i have a trans heat pump and I'm trying to connect the honeywell rth9580wf to it. it only has two wires
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: a red and white. I connected the white to the C and the Red to R1. I plugged it in and it just flashes
JA: Do you plan on doing the work yourself?
Customer: im simply replacing a thermostat the heat pump is already installed
JA: Anything else we should know to help you best?
Customer: no I'm just upgrading a thermostat and there are only 2 wires
Submitted: 3 months ago.
Category: HVAC
Expert:  BillyHvac replied 3 months ago.

hello,

you need 3 wires for this to work....is there another unused wire in the cable?

Customer: replied 3 months ago.
no i only see three wires
Customer: replied 3 months ago.
let me look in the wall for more wires
Expert:  BillyHvac replied 3 months ago.

standing by

Customer: replied 3 months ago.
ok in the wall are yellow, blue and green. They were not connected to the previous thermostat.
Expert:  BillyHvac replied 3 months ago.

thank you.

now first...the red goes to R, the white goes to W...the blue we will put on C.

But 2 things...

1 - the blue wire at other end in furnace must be attached to a C (or if trane possibly a B)

and 2 - wiring white to C would have shorted the low voltage system.

Can you give me model number of the indoor furnace?