I had the same issue with the ac not turning on. There really is not a way to check the outdoor unit without the thermostat. 1. I spent hours (3+) on the phone with Nest customer support to no avail. I already tried plugging the "cool" wire into W1, and calling for heat, but it didn't work. The heat worked fine all winter, but AC was never tested. It looks like others may have this issue, but I cannot find a solution. AC Fan Turns On, But Not Compressor. Is the fan on the outdoor unit running when you turn on the ac? But if the outdoor fan comes on when you turn the thermostat to ac. I think there is also a built in delay. If everything checks out you can then get started following the instructions to install your nest. hide. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. Discussion on Google Nest products, including installation and configuration. Fuses and breakers are fine. Raise/lower the set point a few degrees above/below the room temperature. It got worse, though. If it works look into getting a common wire installed. It’s an outdoor compressor. (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. Not running. … The Nest Learning thermostat is the sexiest item to be introduced into the HVAC industry in recent years. The only change was the thermostat. 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. 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. Something you wouldn't get on a dumb thermostat, but you would get on a smart one. The fan blows, but the AC compressor stays off. The fan blows, but the AC compressor stays off. 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. If needed, re-insert wires so that the connector button stays fully pressed down. When I installed my Nest thermostat it was blowing hot air instead of cold. 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 NEST. share . Could be a problem with the outdoor unit. Thanks! save. Posted by 2 years ago. 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. Blown-out fuse on the HVAC system. Not the thermostat. NEST can be controlled from the Echo via IFTTT but it’s not stable. Tested heating, the fan was on but compressor would not run. Report Save. We did a complete reset back to factory settings and a restart. I tried both methodes of using the yellow or the green as the common. Nest thermostat has power issues. Turn off your thermostat. So coming up on three years with the Nest thermostats with no problems. The fan did not operate in cooling mode. I called in a "Nest Pro" to no avail. Is your AC unit not turning on? Nest thermostat won’t turn on AC compressor. 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. Press J to jump to the feed. 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. 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. NorCal Nest Pro 1 year ago. AC Fan Turns On, But Not Compressor. level 2. 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. Or maybe it's running but not cooling? Help! None whatsoever. You can not turn the ac on and off. Cookies help us deliver our Services. Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. Not sure if this eventually happens with all Nest thermostats or most or if it matters what kind of a system one has. 4 4. report. Compressor lockout. 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". Currently set to 69.8, current temp is 77. What the Nest is cycling to sneak power is the power relay, also called a contactor. The hope is that the process does not start the AC compressor. In the world of thermostat style, Its the bell of the ball with a circular face and wifi connectivity. I even bought a new Nest because we thought that the first Nest … Simply turning the thermostat to “on” might not be enough, especially if your thermostat doesn’t have backup battery power. By using our Services or clicking I agree, you agree to our use of cookies. Press J to jump to the feed. There should be a 3 to 5 min delay between turning it on and off. 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. New comments cannot be posted and votes cannot be cast. And I have no “C” wire. Nothing worked. Go to duct and put your hand in front to feel the hot air coming out. Try it without the Y1 wire. Solution- the wiring had the 5th wire still available but not used. 2. share. Archived. 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