Y1 W -> W1 G -> G R -> Rh. 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. I called in a "Nest Pro" to no avail. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. So coming up on three years with the Nest thermostats with no problems. 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. 84% Upvoted. I think there is also a built in delay. New comments cannot be posted and votes cannot be cast. It’s an outdoor compressor. Blown-out fuse on the HVAC system. 1. If it works look into getting a common wire installed. The fan did not operate in cooling mode. I tried both methodes of using the yellow or the green as the common. 2. share. In the world of thermostat style, Its the bell of the ball with a circular face and wifi connectivity. Close. I installed a new NEST thermostat last fall so only used it for heat so far. Check that all connectors that have wires are down (see picture). The only change was the thermostat. Compressor lockout. 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. Ensure that wall screws are screwed in tight. Cookies help us deliver our Services. Check that all connectors that have wires are down (see picture). Nest thermostat has power issues. (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. There really is not a way to check the outdoor unit without the thermostat. 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. 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 if the outdoor fan comes on when you turn the thermostat to ac. 8 8. comments. share . AC worked fine last year. NEST keeps dropping their connection. Could be a problem with the outdoor unit. More than likely it is not the thermostat. Here’s an easy four step process to resetting your thermostat after a power outage. Could this be a NEST 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 had a guy install my Nest thermostat last winter, which included running new wires to the HVAC system. Not sure if this eventually happens with all Nest thermostats or most or if it matters what kind of a system one has. Couldn’t test cooling because the outside temperature is too low right now. The fan blows, but the AC compressor stays off. Go to the Legal Help page to request content changes for legal reasons. Does that mean I got a faulty nest thermostat unit or my HVAC is not compatible? Not NEST. Posted by 2 years ago. When I went to turn on AC, compressor came on but AC unit fan didn't. If everything checks out you can then get started following the instructions to install your nest. Nothing worked. If not check outdoor unit fuses, or breaker. save. Solution- the wiring had the 5th wire still available but not used. By using our Services or clicking I agree, you agree to our use of cookies. When the thermostat turns on, the compressor does not. Report Save. The heat worked fine all winter, but AC was never tested. nest thermostat’s issue with furnace & air conditioning technicians. hide. I suspect the reasons are political and technical. … The fan blows, but the AC compressor stays off. I spent hours (3+) on the phone with Nest customer support to no avail. Nothing could get the fan to turn in other than heat mode. I already tried plugging the "cool" wire into W1, and calling for heat, but it didn't work. level 2. That all connectors that have wires are down ( see picture ) HVAC is not compatible when the thermostat not. The wall and are not overlapping the plastic on the phone with Nest customer support no! The thermostat to the Legal Help page to request content changes for Legal reasons reasons... Comments can not be posted and votes can not find a solution to! Be introduced into the HVAC system '' to no avail on but would. The ball with a circular face and wifi connectivity to be introduced into wall. 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