Could be a problem with the outdoor unit. Not running. The fan did not operate in cooling mode. I suspect the reasons are political and technical. Discussion on Google Nest products, including installation and configuration. My old thermostat used Y, W, G & R, installed a 3rd gen nest thermostat according to the recommended wiring from nest website: Y -> Y1 W -> W1 G -> G R -> Rh. There really is not a way to check the outdoor unit without the thermostat. level 2. Something you wouldn't get on a dumb thermostat, but you would get on a smart one. Press question mark to learn the rest of the keyboard shortcuts. Working directly on the thermostat – not through the Sensi app – set the thermostat to the Cool Mode/Heat Mode. Is the fan on the outdoor unit running when you turn on the ac? Discussion on Google Nest products, including installation and configuration. When I installed my Nest thermostat it was blowing hot air instead of cold. The only change was the thermostat. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. report. 8 8. comments. The Nest Learning thermostat is the sexiest item to be introduced into the HVAC industry in recent years. I already tried plugging the "cool" wire into W1, and calling for heat, but it didn't work. 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. I think there is also a built in delay. Check that all connectors that have wires are down (see picture). Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. AC worked fine last year. 4 4. The heat worked fine all winter, but AC was never tested. Posted by 2 years ago. The furnace blower motor turned on and runs constantly. share . Press J to jump to the feed. If it works look into getting a common wire installed. (or simply deal with the minor inconvenience of plugging the Y1 back in the summer), New comments cannot be posted and votes cannot be cast. save. It looks like others may have this issue, but I cannot find a solution. But if the outdoor fan comes on when you turn the thermostat to ac. The fan blows, but the AC compressor stays off. Does that mean I got a faulty nest thermostat unit or my HVAC is not compatible? Seems like a lot of people has issues that can damage their HVAC when they run a Nest Thermostat without a C wire, Nest should really stop supporting that setup option. Nothing worked. hide. I suspect it’s a wiring issue, but wanted to see if anyone else is having this issue. Go to the Legal Help page to request content changes for legal reasons. Report Save. Pull off the Nest thermostat display. Solution- the wiring had the 5th wire still available but not used. Nothing could get the fan to turn in other than heat mode. 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. If needed, re-insert wires so that the connector button stays fully pressed down. 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". NorCal Nest Pro 1 year ago. I had a guy install my Nest thermostat last winter, which included running new wires to the HVAC system. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. AC Fan Turns On, But Not Compressor. I called in a "Nest Pro" to no avail. Ensure all thermostat wires are tucked back into the wall and are not overlapping the plastic on the sub-base. 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. At first I thought I might blew the capacitor but I swapped my old thermostat back for a test and heating worked well, both fan and compressor were able to turn on normally. Turn off your thermostat. I installed a new NEST thermostat last fall so only used it for heat so far. Go to duct and put your hand in front to feel the hot air coming out. Nest thermostat has power issues. I spent hours (3+) on the phone with Nest customer support to no avail. 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. Cookies help us deliver our Services. Simply turning the thermostat to “on” might not be enough, especially if your thermostat doesn’t have backup battery power. The fan blows, but the AC compressor stays off. NEST can be controlled from the Echo via IFTTT but it’s not stable. Close. Fuses and breakers are fine. I don’t know exact model number of my HVAC but I know it’s a GE and it is not that old... Late, but what you might be having is a compressor lock out. Compressor lockout. 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. Not the thermostat. When I went to turn on AC, compressor came on but AC unit fan didn't. Here’s an easy four step process to resetting your thermostat after a power outage. Press J to jump to the feed. In the world of thermostat style, Its the bell of the ball with a circular face and wifi connectivity. It got worse, though. Nest doesn't turn on AC compressor. The heat worked fine all winter, but AC was never tested. 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. By using our Services or clicking I agree, you agree to our use of cookies. Thanks! 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. More than likely it is not the thermostat. Blown-out fuse on the HVAC system. Or maybe it's running but not cooling? Couldn’t test cooling because the outside temperature is too low right now. Is there any way to force the AC to turn on without thermostat, to see if it works? There should be a 3 to 5 min delay between turning it on and off. What the Nest is cycling to sneak power is the power relay, also called a contactor. I tried both methodes of using the yellow or the green as the common. If not check outdoor unit fuses, or breaker. So I guess this rules out the Y1 port being faulty, as cooling isn't being triggered even from the W1 port which I know works. Couldn’t test cooling because the outside temperature is too low right now. One way you can resolve this is by connecting your Nest to a constant power wire from the furnace. Not sure if this eventually happens with all Nest thermostats or most or if it matters what kind of a system one has. 2. share. Check that all connectors that have wires are down (see picture). Is your AC unit not turning on? Archived. Nest thermostat won’t turn on AC compressor. I had 4 wires on the old thermostat. 1. I had the same issue with the ac not turning on. I had a guy install my Nest thermostat last winter, which included running new wires to the HVAC system. You can not turn the ac on and off. nest thermostat’s issue with furnace & air conditioning technicians. … And I have no “C” wire. Currently set to 69.8, current temp is 77. 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. Not NEST. Ensure that wall screws are screwed in tight. Try it without the Y1 wire. 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. It’s an outdoor compressor. New comments cannot be posted and votes cannot be cast. When the thermostat turns on, the compressor does not. We did a complete reset back to factory settings and a restart. 84% Upvoted. Press question mark to learn the rest of the keyboard shortcuts. Raise/lower the set point a few degrees above/below the room temperature. The hope is that the process does not start the AC compressor. So coming up on three years with the Nest thermostats with no problems. I just had maintenance done on it last summer, and it was fine. If everything checks out you can then get started following the instructions to install your nest. I even bought a new Nest because we thought that the first Nest … Tested heating, the fan was on but compressor would not run. NEST keeps dropping their connection. None whatsoever. 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