I am attempting to install a new Honeywell RTH230B. It has a 5 wire hook up but the old unit I am replacing has a 6 wire hook up. On the old unit the wiring is Yellow-Y, Green-G, Red-R, Brown-O, White-W2, and Blue-C

I understand I need to use the jumper, but where and where do I hook the other wires up to?

Manual is here: http://customer.honeywell.com/TechLi...0s/69-1800.pdf

On page 1, I states: Note: These thermostats are not compatible with heat pumps or multi-stage systems.

You have a heat pump with aux/emg heat (W2). Obvious because of the "O" wire.

The stat you have won't work.

FYI: Most of the time, the "C" wire is optional when the stat uses batteries for power. Batteries are used in some stats because the old mercury switch thermostats didn't require a common.

Thanks for the answer/responce. I figured that out this morning after reading the back of the packaging a little closer. After being opened, hopfully Home Depot will accept it back.

Thanks again.

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Originally Posted by smd4930

Hopefully Home Depot will accept it back.

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There isn't much that they won't take back. Just look at all the taped-up packages next time you visit. :rolleyes: