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

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