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