Installed Nest Blowing Hot Air

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The reason your nest thermostat is not cooling is because you incorrectly labeled your wiring according to the "conventional" side of your old thermostat, instead of using the "heat pump" side. To fix this, relabel the wiring from your old thermostat setup using the heat pump side and rewire your nest accordingly. If so, check your o/b orientation on the nest. Most heat pumps use the o orientation but if you have a older rheem unit like i do you will need to use the b orientation.

Nest thermostat installed but ac blowing warm air. Nest thermostat gen 1 was just installed after switching from a honeywell digital. Everything seems to be working but the ac is now blowing warm air. Worked before installing the new unit. I had it running for 30 min last night and the temperature just kept climbing. Make sure you have a heat pump system 2. Run a diagnostic test on your thermostat 3. Change the o/b wire settings 4. Check the wire if you weren't able to resolve the issue with the.