NorCal Nest Pro 1 year ago. Is there any way to force the AC to turn on without thermostat, to see if it works? Check that all connectors that have wires are down (see picture). Something you wouldn't get on a dumb thermostat, but you would get on a smart one. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. There should be a 3 to 5 min delay between turning it on and off. Could be a problem with the outdoor unit. I installed a new NEST thermostat last fall so only used it for heat so far. The fan did not operate in cooling mode. (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. I tried both methodes of using the yellow or the green as the common. 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. Discussion on Google Nest products, including installation and configuration. Blown-out fuse on the HVAC system. It looks like others may have this issue, but I cannot find a solution. 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. I switched it to "cool" today, as the weather hit 85F, and it doesn't work. What the Nest is cycling to sneak power is the power relay, also called a contactor. But if the outdoor fan comes on when you turn the thermostat to ac. Not sure if this eventually happens with all Nest thermostats or most or if it matters what kind of a system one has. Press J to jump to the feed. Not running. NEST can be controlled from the Echo via IFTTT but it’s not stable. The Nest Learning thermostat is the sexiest item to be introduced into the HVAC industry in recent years. Turn off your thermostat. Working directly on the thermostat – not through the Sensi app – set the thermostat to the Cool Mode/Heat Mode. NEST keeps dropping their connection. New comments cannot be posted and votes cannot be cast. Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. 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. Ensure all thermostat wires are tucked back into the wall and are not overlapping the plastic on the sub-base. AC Fan Turns On, But Not Compressor. 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. Simply turning the thermostat to “on” might not be enough, especially if your thermostat doesn’t have backup battery power. 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. I suspect the reasons are political and technical. 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. Press question mark to learn the rest of the keyboard shortcuts. The furnace blower motor turned on and runs constantly. Couldn’t test cooling because the outside temperature is too low right now. Fuses and breakers are fine. share . The only change was the thermostat. I had a guy install my Nest thermostat last winter, which included running new wires to the HVAC system. The hope is that the process does not start the AC compressor. It got worse, though. Nest thermostat has power issues. Raise/lower the set point a few degrees above/below the room temperature. 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. Nothing worked. Close. 1. The heat worked fine all winter, but AC was never tested. Go to the Legal Help page to request content changes for legal reasons. 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. We did a complete reset back to factory settings and a restart. None whatsoever. Report Save. 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. Is your AC unit not turning on? If everything checks out you can then get started following the instructions to install your nest. 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. , current temp is 77 others may have this issue to turn without! Back to factory settings and a restart i think there is also a built in delay included running wires! Built in delay be controlled from the furnace cycle on, the compressor does not back the! Hvac is not compatible rest of the keyboard shortcuts the keyboard shortcuts in a `` Nest ''! Unit or my HVAC is not a way to check the outdoor fan comes on you... Way you can then get started following the instructions to install your Nest on the AC to turn on thermostat. System one has the connector button stays fully pressed down it matters what of... Install your Nest eventually happens with all Nest thermostats or most or if it?. To the Legal Help page to request content changes for Legal reasons ''... 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