Troubleshoot when heating and cooling are reversed

If your system starts to blow cool air when your Nest thermostat is in heat mode (or if it blows warm air when it's in cool mode), change the settings for orientation of your heat pump.

Nest Learning Thermostat (4th gen) and Nest Thermostat

1. Open the Home app .
2. Tap your thermostat.
3. At the top right, tap Settings .
4. Select Thermostat.
5. Scroll until you find Heat pump. It should show which wire configuration is currently selected.
   • If the O option is highlighted, select B.
   • If the B option is highlighted, select O.
6. To make sure the issue is resolved, test your heating and cooling again.

You can indicate what system should go with unspecified wires. Empty terminals will show “-”.

Nest Learning Thermostat (3rd gen or earlier) and Thermostat E

1.  On your thermostat, go to Settings .
2. Select Equipment.
3. Select Continue Continue.
4. Select Heat Pump.
5. 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.
6. To make sure the issue is resolved, test your heating and cooling again.