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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I am having a problem with wiring a new Honeywell 9580

Customer Question

I am having a problem with wiring a new Honeywell 9580 thermostat from an old white Rodgers thermostat
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I am having a problem with wiring a new Honeywell 9580 thermostat from an old white Rodgers thermostat
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: The wiring is different for the new Honeywell model versus the old white Rogers model
Submitted: 10 months ago.
Category: HVAC
Expert:  airheatman replied 10 months ago.

I will be glad to assist you.First give me model on old and tell me what wires went where on old

Customer: replied 10 months ago.
The old was white rogers
Customer: replied 10 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  airheatman replied 10 months ago.

Did yo take a pic before removing or write down what wires were connected where?

Customer: replied 10 months ago.
W to white, g to green y yellow, and two wires, r to red, and a second red wire from RH to RC
Expert:  airheatman replied 10 months ago.

Oh you are also going to need a C wire for the Honeywell to work.Is there an extra wire in bundle that you can use?

Customer: replied 10 months ago.
a blue wire, and I tried it to the C slot. It didn't work, and my new Honeywell 9580 still won't come on
Expert:  airheatman replied 10 months ago.

OK so let me make sure I understand.

Coming out of wall you have 5 wires. (Red,white,Green yellow and blue)

Red to R with a jumper to RC

Green to G

White to W

Yellow to Y and

Blue was unused.

On new

Red to R with jumper to RC

Green to G

Yellow to Y

White to W-O/B

Blue to C Is this correct?

Customer: replied 10 months ago.
Correct yet that doesn't work.
Expert:  airheatman replied 10 months ago.

OK if you did not turn power off before removing wires, they probably touched each other and blew a little fuse in air handler.What is model on indoor air handler and I will tell you where to look.

Customer: replied 10 months ago.
I turned the power off. I have a rheem indoor air handler
Customer: replied 10 months ago.
I will be happy to look though
Expert:  airheatman replied 10 months ago.

Is it a gas furnace ?

Customer: replied 10 months ago.
Expert:  airheatman replied 10 months ago.

Remove both panels. Look in blower compartment and locate control board.Remove fuse and see if it is blown.

http://i.imgur.com/pKP74Wg.png

http://i.imgur.com/kYe4Epz.png

Customer: replied 10 months ago.
Fuse is ok
Expert:  airheatman replied 10 months ago.

Do you have a multi meter for checking voltage?

Also do one more thing. Since blue was not connected at thermostat lets make sure it is connected to C on furnace board.If not we have to connect it

Customer: replied 10 months ago.
Strange thing is there is no blue on furnace board... But there is three white wires! 1 connected with yellow at Y, one in the W slot, and one in the C slot!
Expert:  airheatman replied 10 months ago.

Can you follow it and see if maybe it is connected to the blue somewhere,maybe at a float switch or something

Customer: replied 10 months ago.
Blue is just wrapped up and not connected to anything
Expert:  airheatman replied 10 months ago.

Connect it to C along with the wire that is already there

Customer: replied 10 months ago.
Only one white is being run upstairs to the unit, and it is in W in both places
Customer: replied 10 months ago.
Ok, it's done
Customer: replied 10 months ago.
Still not working!
Expert:  airheatman replied 10 months ago.

Got door back on furnace?

Customer: replied 10 months ago.
Hello? Any other ideas?
Expert:  airheatman replied 10 months ago.

Go to thermostat loosen R and G wires and touch wires together and tell me if blower comes on.