I have had to replace a Honeywell thermostat that is <5 years old because of moisture/corrosion problems with the buttons. I followed the instructions exactly, but it isn't working correctly. It seems to be heat on all settings.

I took a photo of the old wiring:


I wired the new thermostat using the same letters and colors...


Now when I turn on the air-- it is hot air.

I chose these settings:

0170 : 9 (Heat/Cool Multiple states: 2 heat stages (wires on W and W2), 1 cooling stage (wire on Y) {because the wires indicated this, I hope}

0180 : 1 electric heat

0190 : it didn't give me this option
0240/0270: it didnt give me these options

0300: automatic changeover

0530: smart response technology 1 on

What alarmed me on the instructions was this:
Heat Pump
Alternate wiring (heat pump system only)
** If your old thermostat had a Y1, W1 and W2 wires, stop now...

the only writing I could find on my unit was:


Do you have suggestions?
Thank you,
Heather

 

You have a heat pump system. So you need to set the stat step #170 to 7. Then 240 or 270 to 3.

 

Thank you so much for answering! I have my nephews this weekend so having heat/air is great!! I haven't posted in a forum ever before-- very cool.

Can I also ask-- when I changed to option 7, it opened some other functions that weren't available before.

0190: Heat Pump Changeover Valve (choose 0 for Cooling changeover valve or choose 1 for Heating Changeover Valve) it said to use one or the other based on how the wire was labeled previously. My wire was blue but went into the slot that was marked O/B so I wasn't sure which to choose? (would guess B for Blue but haven't found that to be consistent every time)

Also-- I chose 3 in the 270 function (Emergency Heat Cycle Rate) as you mentioned. The thermostat now reads " Emergency Heat --- Off ---Cool" now on the thermostat. Would this be correct? Should it say "Heat" rather?


Thank you so much-- and thank you for taking time to do this. Amazing.
Heather

 

Also-- when I set the thermostat to cool-- it still blows warm air : (

 

What is 190 set to now? If it's 0 then set it to 1. Or if it was 1 set it to 0.

The stat should read, Heat-off-cool-Emg heat. when you hit System button.