nest thermostat not turning on ac compressor

by on January 20, 2021

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

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