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