Honeywell Thermostat - Heat works fine but no Air Conditioning

You can try to trace the wires where they lead into your furnace. there should be some of the control wires leading to the AC control.Perhaps you can trace them to the circuit in the furnace control box where your thermostat wires lead into. Make sure the power is off. and disassemble the control box. See if you can trace the small circuit board a little and figure out which control wire is the load side then trace it back to the thermostat wire. Sometimes wires get mixed up on one side or the other. As far as functionality is concerned Electricity doesnt care what color a wire is. Then read the manual and you might be able to determine which is the AC on and which is the FAN. Then after you get the right wires identified, Head up to the thermostat and make the appropriate changes to the wiring to match it. If you have a small voltage tester you can also test each lead and determine them that way as well. Keep posting comments and ill check and see if you reply. I hope this gives you somewhere to start.

Hi

You'll need to connect the wires as described below--

Connect wires:
Red - to terminal R (leave the jumper on the thermostat terminal to RC)
Blue - to terminal C ( this should be your -24VAC common wire). If you have a multimeter, set your meter to VAC and measure voltage between Red and Blue, you should read 24-28VAC control voltage.
Green - to terminal G, this is your wire for your blower (fan).
Yellow - to terminal Y, this wire is to power up your 24VAC contactor in your outdoor unit during heating and cooling.
Orange - to terminal O/B, this is your wire when your system is in cooling mode. This wire is powered up during cooling only. Most unit operate during heating mode with this wire de-energized (no power).
White - to terminal AUX, install jumper wire to E ( E, is for your emergency mode, electric heat is powered up). Your white wire is energized when your unit goes on defrost mode energizing your electric heat and demand for heat load is required.

Don't forget to configure your unit by going thru the codes and changing them appropriately for heat pump operation. Read the programming mode carefully don't rush. Also don't forget to remove the tab to activate the batteries.

Please tell me what all you would be using with your honeywell(like a gas furnance or an Airconditioner or both)


Please do accept this solution and revert for further assistance.

Thanks
Rylee