Not wired correctly for heat

[micherein]

We just moved in and tried to replace a Honeywell Thermostat with the Nest.

Looks like the heat function is only blowing cool air, so we think we wired things incorrectly, but aren’t sure what to do to fix it. 

Here’s the previous wiring with Honeywell:

Previous Honeywell wiring

Here’s how we tried to wire our Nest (wire labels added by us, so they may not be accurate):

Attempted Nest wiring

Update:

Here is a link to the model of the system we see outside: Rheem RP1424AJ1NA 2.0 Tons Classic 14 Seer Heat Pump 1 Stage R410A 208-230/60/1

We found out there are two sets of wires behind the plate; they are currently connected to the Nest as follows

Left set:

• Blue - (pictured with exposed copper)
• White - W2aux
• Red - Rc
• Green - G
• Yellow - Y1

Right set:

• Blue - (snipped/not connected)
• White - C
• Red - (snipped/not connected)
• Green - Ob

Could someone please help us figure out which wires need to be swapped/moved to get the heat to work? Thanks in advance!

[tajennifer]

Hi micherein,
 
Thanks for posting. I'm sorry to hear about the situation that you are experiencing with the Nest thermostat installation. In this case, I need to ask: is your system a heat pump one? If yes, please try with these steps: 
 

•  On your thermostat, go to Settings 
• Select Equipment.
• Select Continue > Continue.
• Select Heat Pump.
• The Nest Thermostat defaults to an O setting for heat pumps. 
  • If the O option is highlighted, select B.
  • If the B option is highlighted, select O.
• To make sure the issue is resolved, test your heating and cooling again.

If your system is not a heat pump, please try to move the W2 Aux wire to the W1 terminal and test the heat mode.
 
Please keep me posted. I'll be waiting for your response.

 
Best regards,

 
Jenny

[micherein]

Hi @tajennifer , thanks so much for your reply!

Per your recommendation, we did attempt to flip the settings between O & B, but still couldn’t get the heat to come through. We have no experience with HVAC  — but upon looking up the model, it looks like we do have a heat pump. We also just noticed that there appears to be two sets of wires available for wiring up the thermostat — not sure what that’s about. We updated the post with more details on what we found. 
Do you have any more suggestions on how to help us move forward? Anything helps! Thanks in advance!

[tajennifer]

Hi micherein,

Thanks for your reply and the update. I understand that changing the orientation of the O/B did not solve the problem. Let's try with other options: 

In this case, we need to know if the system is a single-fuel or dual-fuel one. Please follow these steps:

1. On the thermostat, select Settings > Equipment to check if the thermostat is properly set up for your system.
   
   • If the W1 or W2 label says Alt on the Equipment screen, the HVAC system is on dual fuel. If it says Aux, the system is set as single fuel.
   • If it says Alt and the system is all electric, or if it says Aux and the HVAC system has a gas or oil heating system, the thermostat isn’t properly set up.
2. For improperly set up systems, select Continue > Continue > Pro Setup > Continue > Single Fuel or Dual Fuel > exit Pro Setup.

After checking the information with the steps above and changing it to the correct setup, you can try these steps depending on the type of system that you have: 

• For single fuel systems
  1. On the thermostat or in the Nest app, select Settings > Equipment > Continue > Continue.
  2. Select Heat Pump > Orientation > Heat Pump Temperature (you may leave it set to always).
  3. Select Aux Heat Temperature > Set the temperature you want.
     • The recommended temperature is 45°F (7°C), but heat pumps isolated from the cold can get to lower temperatures.
     • If you can’t change this temperature setting, go to Settings > Nest Sense > Heat Pump Balance > Off.
• For dual fuel systems
  1. On the thermostat screen, select Settings > Equipment > Continue > Continue.
  2. Select Dual Fuel > Set the temperature where the Alt Heat should start.

Please keep me posted.

Regards,

Jenny