Nest Thermostat Only Blowing Hot Air
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Turn off power to your system, then pull off the thermostat display. If there's a white wire or no wire in the o/b terminal, you probably have a conventional system, not a. Verify the thermostat is wired correctly. Make sure the thermostat is configured correctly for the heating /cooling system type.
If the above information has been verified and the issue is still present, contact a hvac professional. Press on your nest thermostat unit to bring up the main menu. Use the silver scroll wheel and go to "thermostat". Push on the unit to select it. 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.