Nest Thermosat wired up but only blowing cold air now. Please help!

[KMZT]

I had my landlord come over and wire in a new Nest 3rd gen learning thermostat but it seems that my heat isn't working now.  Put the thermostat up a couple degrees, and it doesn't heat up, only blowing cold air.  It said it was compatible with my 7 wire set up but not sure what the problem is. 

Wires are as follows... R C GL GH O/B Y W
Where should these go in the nest thermostat? 

Help!

[Houptee]

Just match up the wires but don't use the G wires.

If you are getting ac instead of heat you can change the settings for the OB output it has A or B change it to the opposite see if heat comes on.

It has to be set up as a heat pump also.

[KMZT]

Hey Houptee,

Thanks for the reply! 

Is it best practice for me to not use any G wire?

Forgive my ignorance if not true but I was under the impression that with my system (electric heat with a heat pump) a G wire was needed to kick on the fan. 

I don't really know how my fan would turn on without at least one of the wires is put into a receptacle.

I appreciate your Master HVAC knowledge on the subject and look forward to your reply!
Thanks!

[Markjosephp]

Hello folks,

I'm dropping by and see how I could help.

Thanks for lending a hand here, @Houptee.

@KMZT, It appears that your system has a multi-speed fan with GL (low) and GH (high). When using multiple fan speeds, some HVAC functions will become unavailable. Let's sort this out.

Could you share a photo of your Nest Thermostat's wiring with us? Are the fan and cooling systems working independently? Following Houptee's advice about changing the orientation might help. Please follow the steps here:

1. On the thermostat, go to Settings > Equipment.
2. Continue > Continue > Heat pump.
3. The option that is highlighted will be the default; switch to the other option.
4. Follow the prompt to confirm.
5. Restart your thermostat to refresh.

Let us know how it goes.

Regards,

Mark

[Houptee]

Some systems kick on the fan without a G wire and only need the G if you want to run the fan only without heat or AC on.

But I just realized you have muti speed fan so you would need to follow Markjosephp advice below.

Or you could take the cover off the air handler and there is usually a decal on the cover with wiring diagram and it shows thermostat wiring info. Usually there are notes, little triangles with numbers, and then a chart explaining what the notes mean.

[Markjosephp]

Hi KMZT,

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or concerns.

Thanks,

Mark

[Markjosephp]

Hey there,

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 trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Mark

[Markjosephp]

Hello KMZT,

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

Thanks,

Mark