Nest thermostat wires for heat pump Blow Hot

[NguoiViet41]

Hi

I Need help on Nest Thermostat with heat pump system 

after wires with Nest Thermostat i got hot air

Thankssssssss

my original wires

G  -  Green

C - Blue 

R - Red

y  with jumper w1 - Yellow

W2 and E - White 

O -  Orange

[NguoiViet41]

THIS IS MY OLD THERMOSTART

[Houptee]

Do not use any jumper wires on the Nest.

Try white to W2.

The OB is what changes the unit to Heat or A/C mode, so if it is wrong you have to change the function of OB wire.

Post pic of the Nest wiring.

[NguoiViet41]

I Try Both Still Blow hot

1-wires and setup O or B No Go2-wires and setup O or B No Go

[Markjosephp]

Hi folks,

I wanted to stop by and see how I could help.

Thanks for the assistance, @Houptee.

Great troubleshooting so far, @NguoiViet41. I appreciate that you've tried to find a fix. Let's find out more about what happened.

You can also give this steps a try in this article and let us know how it goes.

Best regards,

Mark

[Houptee]

Leave White wire disconnected and try the A/C mode.

If blows hot, change the O/B function in Nest settings until A/C works and blows cold.

Then once AC is working, now try turning on Heat to see what happens.

If you get heat with white wire still disconnected then the heat pump is working normal.

After the heat pump problem is solved you need to figure out is the White wire for emergency electric backup heat?

[Markjosephp]

Hi there,

I appreciate your assistance, @Houptee.

@NguoiViet41, I'm checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns.

Best regards,

Mark

[Markjosephp]

Hello NguoiViet41.

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

Best regards,

Mark