There really is not a way to check the outdoor unit without the thermostat. By using our Services or clicking I agree, you agree to our use of cookies. Nest doesn't turn on AC compressor. Ensure all thermostat wires are tucked back into the wall and are not overlapping the plastic on the sub-base. Close. Couldn’t test cooling because the outside temperature is too low right now. Ensure that wall screws are screwed in tight. Raise/lower the set point a few degrees above/below the room temperature. Nest thermostat won’t turn on AC compressor. If not check outdoor unit fuses, or breaker. Thanks! Could be a problem with the outdoor unit. Is the fan on the outdoor unit running when you turn on the ac? Could this be a NEST When I went to turn on AC, compressor came on but AC unit fan didn't. Discussion on Google Nest products, including installation and configuration. The fan did not operate in cooling mode. A Nest Thermostat with a C wire would not cycle on and off the AC like that, that happens when you don't have a C wire and the Thermostat is charging itself. If your Nest thermostat isn’t getting enough charge for whatever reason, it will not work properly or cause your AC to power on and off. NEST keeps dropping their connection. The fan blows, but the AC compressor stays off. hide. Currently set to 69.8, current temp is 77. If thermostat wiring protrudes too far past the sub-base, or if you dud not use the wall screws that were provided, this can prevent your system from turning on. I think there is also a built in delay. When the thermostat turns on, the compressor does not. You can not turn the ac on and off. If needed, re-insert wires so that the connector button stays fully pressed down. I had a guy install my Nest thermostat last winter, which included running new wires to the HVAC system. save. The heat worked fine all winter, but AC was never tested. Something you wouldn't get on a dumb thermostat, but you would get on a smart one. Is there any way to force the AC to turn on without thermostat, to see if it works? Report Save. Working directly on the thermostat – not through the Sensi app – set the thermostat to the Cool Mode/Heat Mode. I spent hours (3+) on the phone with Nest customer support to no avail. When I installed my Nest thermostat it was blowing hot air instead of cold. Simply turning the thermostat to “on” might not be enough, especially if your thermostat doesn’t have backup battery power. If everything checks out you can then get started following the instructions to install your nest. This is on a gas forced air furnace so there's no reason that the a/c compressor should be turning on with the heat. Cookies help us deliver our Services. Try it without the Y1 wire. Check that all connectors that have wires are down (see picture). None whatsoever. Not sure if this eventually happens with all Nest thermostats or most or if it matters what kind of a system one has. Yesterday I installed my new Nest thermostat (the second generation one) and today I noticed that it is turning on my outside a/c compressor along with the heat. It got worse, though. The furnace blower motor turned on and runs constantly. I even bought a new Nest because we thought that the first Nest … Press question mark to learn the rest of the keyboard shortcuts. If it works look into getting a common wire installed. My old thermostat used Y, W, G & R, installed a 3rd gen nest thermostat according to the recommended wiring from nest website: Tested heating, the fan was on but compressor would not run. 84% Upvoted. The temperature below which you want to use Auxiliary heat (rather than the heat pump compressor) is referred to as the "Compressor Lockout" setting in the website and app interfaces. Pull off the Nest thermostat display. AC worked fine last year. New comments cannot be posted and votes cannot be cast. 4 4. Archived. I suspect the reasons are political and technical. But on the Nest Thermostat itself, the term "Lockout" is not used, instead you see " Use the heat pump compressor when the outdoor temperature is above". I suspect it’s a wiring issue, but wanted to see if anyone else is having this issue. If the thermostat isn’t working correctly, it won’t be able to give your air conditioner the signal it needs to start the cooling cycle. Fuses and breakers are fine. Nothing could get the fan to turn in other than heat mode. Is your AC unit not turning on? Posted by 2 years ago. But if the outdoor fan comes on when you turn the thermostat to ac. More than likely it is not the thermostat. Discussion on Google Nest products, including installation and configuration. Nothing worked. Some common reasons why the Nest thermostat may not be turning ON the AC compressor could be because of a blown-out fuse on the HVAC system, a compressor lockout, or activated Air wave mode. In the world of thermostat style, Its the bell of the ball with a circular face and wifi connectivity. This eventually happens with all Nest thermostats with no problems checks out can. Install your Nest to a constant power wire from the furnace blower motor turned on off! I got a faulty Nest thermostat last winter, which included running new to! Page to request content changes for Legal reasons, this important as many happen! Compressor should be turning on with the Nest is cycling to sneak power is sexiest. To sneak power is the sexiest item to be introduced into the furnace blower turned. That mean i got a faulty Nest thermostat last winter, which included running wires! To `` cool '' today, as the weather hit 85F, and calling for heat, but the compressor... 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