Hi there, I have a thermostat controls both heat ( with hot water system) and the AC in my apartment and is connected to a heat pump. Unfortunately it recently died and the model is discontinued so I am trying to figure out what replacement model I need. [b]Model name:[/b] TH2110D1009 ( This is not a 1009/U SKU). The current wiring of the dead thermostat look like this: Now if you look at the installation manual ( [url=https://s3.amazonaws.com/s3.supplyhouse.com/product_files/TH1100D,TH1110D,TH1210D,TH2110D,TH2210DInstall.pdf]link here[/url] ) you see the wiring options on page 3 that looks like this: I believe the unit is wired similar to the last schematic. However, that is not the model I have. For 1H1C with heat pump, my unit should have been wired similar to the second schematic but it is clearly missing connection (3 )- shorting Y and W (circled in the above image). I need your help to understand what I need and how to wire the replacement. Thank you for your time and help.

I'm currently working under the impression that the replacement Honeywell thermostat I've purchased is suitable for controlling my heat pump, however after initially installing the new thermostat I'm not able to get any heat produced. Cooling works fine and the blower/fan turns on without issue for all modes, but heat and EM heat are a no go right now. I would add also that EM heat seems to push cold air and Heat just runs the fan/blower without hot or cold air. My current wiring is as follows: Old unit: R - Red B - Blue G - Green Y - Yellow X - Black O - Orange W - White There is a brown wire left unused in the wall. New Unit: R - Red C - Blue G - Green Y - Yellow W2 (Aux) - Black O/B - Orange White is left unused (per my understanding of the manual) Brown continues to be left unused Thermostat mode Setup: 200 - 2 (heat pump) 205 - 7 (air to air heat pump) 218 - 0 (reversing valve energize in Cool) 220 - 1 (single cool / compressor stage) 221 - 1 and 1 (single heat stage, single backup heat stage) 300 - 0 (manual system change over) 425 - 1 (smart response enabled) Pictures of before/after below. Also worth noting the honeywell website states this particular thermostat "doesn't support EM heat", but when I cycle through the modes it does offer Heat, Cool, and EM Heat. The manual also discusses EM heat is equivalent to Auxilary heat so maybe I am misunderstanding something. Any help here would be greatly appreciated. Thanks, Steve [attach]108170[/attach] [attach]108171[/attach]