Problem using Nest learning thermostat with oil heating and heat pump

[NearlyThere]

Hi there, I am having a problem switching an older thermostat with Nest learning thermostat (the stainless steel one).

Here is the description of my heating and cooling system:

• Cooling Type: Central A/C
• Cooling Fuel: Electric
• Heat Pump - Oil BackUp
• Heating Fuel: Oil

It looks like the previous thermostat was wired the following way:

I tried replicating exactly the same wiring with nest. Also tried splitting the two red wires into Rh and Rc. 

In all cases, the cooling system only started the fan, but not the cooling. Haven't tested heating yet. Would greatly appreciate if anyone could tell me the correct wiring.

[Jake]

Hey NearlyThere,

My apologies for the late response. I wanted to reach out and see if you are still in need of any help? Please let me know, as I would be more than happy to look into the issue further for you.

Best regards,

Jake

[NearlyThere]

Yup, still in the same situation - short of being told I need to hire a Nest Pro to install it, I haven't figured out how to wire it correctly myself

[Jake]

Hey NearlyThere,

Sorry to hear you are still having trouble. Taking a closer look at the picture provided, I am showing there are multiple wires for each thermostat slot. With this being the case, I would recommend having a Nest Pro come out and take a closer look. There is a chance your system may need to be rewired to be compatible with the Nest Thermostat. Sorry about that. Please let me know if you have any other questions from here, as I would be more than happy to help.

Best regards,

Jake

[Jake]

Hey NearlyThere,

It has been a few days since the last reply, and I am going to lock the thread at this time. If you have any questions from here, please feel free to create a new post.

Best regards,

Jake