Nest Learning Thermostat Wiring

[Lstro626]

 

I’m wondering what my next steps should be I have a 7 wire system in my home wires that include

C,R,Y1,W2,G,O,B

When I go into the compatibility checker it says it won’t work, but I’m looking for the next steps. Or anything I should do
please let me know if there is anything I should do?! 

[Houptee]

You have separate O and B wires is the problem why it says not cpmaptible.

Most heat pumps only have one wire (the O/B wire usually orange) that switches the outdoor unit reversing valve to heat or cooling mode.

Is the heat pump an older unit?

Do you have access to the indoor unit so you can remove the cover and confirm if both the O and B are connected at the air handler.

[Lstro626]

Yes it’s an older heat pump, around 2008ish, but I will go see if they are connected to the air handler and get back to you! Thank you

[Houptee]

That is not that old and I would think it only needs one wire to operate.

If you can go to the indoor unit take a pic of the wires connected to the terminal screws so we can see the labels on each screw.

Also on the back of the cover there is usually a decal showing the thermostat wiring diagram take a pic of that.

[Lstro626]

I think I sent it over, in the pictures below! 

[Lstro626]

Here are two pictures I have found! Not quiet sure what it means but 

 

 

[Lstro626]

@Houptee 

[Houptee]

Is the outdoor unit the same brand and age as the indoor unit?

Do you see any wiring diagram decals on the removable cover for the blower?

[Lstro626]

Yes it is, same brand and age, and I’ll send over the picture now

[Lstro626]

 

[Houptee]

OK you have a Gas furnace forced air but do you also have a Heat Pump?

Does the outdoor unit run to provide heat and the gas furnace is used as backup heat?

So do you know it is just an air conditioner outside or a Heat Pump and air conditioner?

You might need to go outside get the make and model number on decal and also take a pic of the thermostat wires connected outside and a pic of any wiring diagrams on the unit.

Some heat pumps have both O and B wires to the outdoor reversing valve that make it change the valve position between Heat and AC mode.

[Lstro626]

Yes we also have a heat pump.

The gas furnace is not the backup

Heat pump and AC outside.

and okay I’ll send a pic of those!

[Houptee]

How were you controlling what was supplying the heat with the old thermostat?

Usually in mild temp you use the heat pump and when it's really cold you switch over to the gas furnace as the 2nd source of heat aka emergency heat.

So did you manually flip a switch on the old tstat to make the gas furnace take over?

[Jhonleanmel]

Hey folks, 

We appreciate your help here, Houptee.
Lstro626, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

[Markjosephp]

Hello there,

Thanks for assisting, Mel.

@Lstro626, I'm checking back in — how's it going? Still need our help? Let us know so we can assist you right away.

Regards,
Mark

[Markjosephp]

Hello Lstro626,

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or coancerns before we lock this thread in 24 hours. 

Thanks,

Mark