Heat coming out during Heat/Cool when it should be cooling

[Ewiener1027]

I just installed my Nest fourth generation thermostat up last week. Everything seemed fine and I had it set to heat and cool. 
I took photos of the existing wiring on the Honeywell before installing the Nest. 

I have residential heat with a heat pump system. 
Orange wire went to W, white went to Y, green went to G, black to W2, and red went to Rc. That is how I installed them for the Nest. 

 

 

 

The thermostat says it’s 76 deg F at the Nest and on the upstairs sensor. It should be trying to get the temperature to 70 deg F.
I just noticed today that it is pumping warm air through the system when it should be cooling. 

Any suggestions? 

[Patrick_Caezza · Accepted solution]

@Ewiener1027 

You have a heat pump system, so use the labels on the right-hand side of the terminal block.

Try this wiring,

Red - Rc to Rc (jumper to R not needed)

Orange - O/B to OB

White - Y to Y1

Green - G to G

Black - AUX-E to W2 (set as AUX heat)

[Ewiener1027]

Thanks. I took a look at the wiring. This could be improved in the on-boarding experience. Using Gemini to look at the existing wiring was helpful in understanding context of the current wiring to the Honeywell. It’s odd that the orange wire was going to a different location for the previous thermostat. 

[Ewiener1027]

@Patrick_Caezza A previous attempt at installing a 2nd gen Nest caused it to wreak havoc on my existing HVAC and it cost me a fortune and almost caused serious damage over-compensating for temperature adjustments, including frosting the A/C in the air handler and leaking condensation everywhere. This is what scared me off Nest previously and HVAC guys don’t seem to like to recommend them. 

[Patrick_Caezza]

@Ewiener1027 

HVAC people don't like any smart thermostat. They seem only to want to sell what they have.

There is no real standard for thermostat wiring colors. There is only a "Best Practice" that most techs use.