No Yellow Wiring

[James26]

I need assistance please. I had someone install my Nest and now he won't return my calls. I do not have a yellow wire for my air condition. Is it possible to put the white wire into the yellow wire spot? As of now I do not have access to my air condition. 

[Patrick_Caezza]

@James26 

NO!

Do not randomly insert wires, as you can damage your HVAC system.

Do you have a picture of the original thermostat wiring?

Can you post a picture of how they wired the Nest?

[James26]

[James26]

@Patrick_Caezza

Here is the current set-up. Unfortunately, I do not have the original thermostat settings.

[Patrick_Caezza]

@James26 

Without a picture of the original thermostat wiring or access to the system, it's all but impossible to figure out why there is no Cooling (Y) wire.

Have you checked the cable behind the base plate and seen if the installer broke the cooling wire off?

Do you still have the original thermostat? If you do, what is the manufacturer and model number of it? Can you post a picture of its base?

[Markjosephp]

Hello everyone,

I wanted to ensure that everything was covered here.

Thanks for looking into this, @Patrick_Caezza.

@James26, how's it going? Have you tried contacting your installer and asking about the wiring configuration? You can also verify your thermostat's wiring from your HVAC system control board itself and look for the corresponding wires to see how they are labeled and if there's a specific wire for your AC unit.

Let us know how it goes.

Regards,
Mark

[Markjosephp]

Hi James26,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[Markjosephp]

Hello James26,

It has been a few days since your last reply, and we're going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Thanks,

Mark

[James26]

I wrote you yesterday about not having a yellow wire to connect to my thermostat. You said to not put the white wire in the yellow spot because I may damage my HVAC. Here are the pics that you requested. I was not able to get a pic of the thermostat setting before it was converted. 

[CoolingWizard]

If your statement is accurate, then either the White wire or the Blue wire was connected to Y in your old thermostat.  The only way to be sure is to get a multimeter and check the AC voltage between R-red wire and the Blue wire.  Make sure that shows 24 Vac +/- 4 volts. 

AC Cooling Wizard

[Patrick_Caezza]

@James26 

I responded in your original post

[Markjosephp]

Hello everyone,

Thanks for the help here, @CoolingWizard and @Patrick_Caezza.

@James26, since there is more information being discussed — I've duplicated your thread in the main one here. You’ll receive all updates on this issue on the main thread, and we recommend updating and checking this thread when needed.

Regards,

Mark