Honeywell PRO2000 thermostat: wiring question


Old 08-19-19, 05:15 PM
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Honeywell PRO2000 thermostat: wiring question

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.

Model name: 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 ( link here ) 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.

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Old 08-19-19, 06:30 PM
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Interesting. It looks like they aren't even using the heat pump to supply heat..... just the hot water.
Do you know if the heat pump was running in the winter ?

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