Did you happen to find a solution? In heat mode the blower would cycle 3 seconds on, 2 seconds off, repeat. In this case, you must get the thermostat replaced. Lack of a common wire of not enough power may make sense. 2. 2. Low level of refrigerant; Missing C wire; Faulty thermostat . I’ve seen others complain about battery problems and software updates, so take it for what it’s worth. It went into a seemingly infinite short cycling loop on January 3rd. So what’s happening? You can check the charge of the thermostat under Settings >> Technical Info. It was clearly diagrammed and labeled where the 24v common wire went. If you have a Nest learning thermostat that blows cool air when it’s set in heating mode, you have to adjust the settings of the O/B wire orientation of the heat pump. If it doesn’t and you hear a mild buzz from within the unit, the problem is with the unit. I have to catch train so I leave anyways. I told them it was BS, since I run my Fan for 30 minutes each night to charge the battery and it never used to be a problem. Otherwise the AC won’t turn on once temperatures really get up there. After some time and reflection I’m not so sure my Nest had enough charge and it just needed some time plugged in with a usb charger. Why does the Nest thermostat keep turning the AC ON? To view this video please enable JavaScript, and consider upgrading to a You might want to check if the base of your thermostat also needs a replacement. Any ideas or further info? So it looks like the Nest throws the same error code for a wide variety of issues. eval(ez_write_tag([[468,60],'voltguide_com-narrow-sky-2','ezslot_21',133,'0','0']));Connect the wire back into the thermostat connector and fit the display. Sometimes, the system circuit breaker or fuse may need to be reset or replaced. eval(ez_write_tag([[300,1050],'voltguide_com-large-leaderboard-1','ezslot_17',104,'0','0']));report this ad. Honestly,  I’m not entirely sure. Was going to try the yellow wire fix but was hoping there would be a better solution 4 years after this article. I initially assumed it was something wrong with the furnace but after reading over this post I figured out we were dealing with the same issue and was able to get the heat going again. 24 volts between Rh and C at the thermostat. I love electronics, computers and everything tech related. I’m thinking it will not start…. And, voila. He said the furnace was overheating and they cleaned the inside of my furnace and cleaned the flame sensor. I have the short cycle problem on HEATING and AC, but not all the time. The explanation I got from Nest phone support was that the extreme cold was affecting the yellow wire that runs outside to the air conditioner somehow. If the temperature is close to the home temperature, there are chances that the thermostat is defective. Both heat pumps were short cycling with the Nests installed, using the old cheap thermostats they both worked fine. Disconnect the power supply to the HVAC system. Same problem. As a side note, I had asked the tech guy if he had a system to peer into the reportbacks from my thermostat. Turn off your furnace, unscrew the panel and insert a new filter. And apologies for such a long post/story, but there is now history here that needs to be understood before the current issues can be troubleshooted. If it does, the Nest is the problem. Using a Nest without a common wire works on most furnaces. So I would try wiring to the RH in this case and check to see if this helps. He turned off the humidifier and the furnace is no longer short-cycling! The author of VoltGuide.com is not a trained electrician or technician. Why A/C Keeps Blowing Fuse in Circuit Board (How to Fix), How to Fix a Furnace 3/5 AMP Fuse that Keeps Blowing, How to Fix TV Noise (Static, Clicks, Buzzing, Beeping), How to Fix a Asus Laptop Keyboard that is Not Working. Reset or replacement needed for the system circuit breaker or fuse. I had switched off power to the furnace so it didn’t have a way to charge all night while it was still hanging out on my wireless network. I came across your article looking for a solution, please update if you get more answers. I checked the battery though and it’s above 3.7. It is clearly a severe cold related issues. Hello, I am a Nest Certified Professional and have experienced this problem today with a customer. Check whether the thermostat is set to operate in Heat mode. In addition, one of the Nest options was set incorrectly, which forced my AC and heater to turn on at the same time even though I wanted only heat. But for the Nest, you need to install a common C wire for it to always work year round. It fixed everything. The Nest Thermostat is pretty easy to use, but it isn’t so apparent how to turn off the thermostat when you don’t need heating or air conditioning on.. RELATED: How to Install and Set Up the Nest Thermostat Sure, you could just set the Nest to “Away” to stop it from heating and cooling, but that won’t work very well if you have Home/Away Assist enabled. And as you have likely already guessed… The AC fan turned on and the Peak Saver power light came on as well and currently for about a day now, it all has been working fine, and the vents have much cooler air blowing and overall temperature is much cooler inside. Upstairs furnace is older, but with the same 4 wire setup and thermostat as the downstairs. Connect the Red and White wires together (twisting, alligator clips, or whatever you’ve got to move those electrons). I was actually out of the house for a couple days so not sure when it started but otherwise it had also been working fine until this polar vortex thing started. Reverse the O/B wire orientation by following the steps mentioned in the “Nest thermostat turns on AC instead of heat” section. Then the heat/fan would run for a couple of minutes. Perhaps when Nest adds to its line up there will be more reason to go Nest, but for a whole-home solution Honeywell is way ahead in automation. These are: Your Nest thermostat is often 10 degrees off because of a resetting problem, a malfunctioning humidity sensor, incorrect sunblock setting, nearby heat sources, or a network connection problem. Your Nest is likely to turn the AC OFF before reaching its temperature because of two main reasons. If your humidity sensor isn’t working properly, your thermostat may feature an OFF reading. Fortunately, we had an extra blue wire that wasn’t hooked up to anything on either the thermostat or furnace end. If the wire is missing, you must consider getting one fitted properly. This often happens if the C wire is inserted into a wrong connector. Nest thermostat has power issues. That's madness. After failing to figure out what was wrong, I called Nest tech support. …I noticed the Peak Saver timer/power interrupter outside, did not show the power light as being ON. Connect the Red and White wires together (twisting, alligator clips, or whatever you’ve got to move those electrons). I am not sure your solution of changing the wiring configuration will work for me. I’ve verified it’s not a power issue, furnace is fine and runs when I swap out with another thermostat. I turned off the breakers and let everything cool down. Have them changed. Let me know if there is a solution thanks. The information on this website should only be used for educational purposes. The webmaster of VoltGuide.com and the author(s) is not responsible for any loss in damages, financial loss and/or personal injury. If you have tried both of these processes and the Nest Thermostat is still giving you trouble, you will need to bring in some experts. Thanks for the yellow wire advice. Nest may try to rapid cycle the heater to get power when low on charge. I charged it via USB overnight, but had the same cycling issue the next day. System blowing hot air? Nest is going on 2 years being installed and no issues until last week. Choose the B option if the default O option is selected and vice versa. I’m not a heating and cooling expert, so I’ll only claim this solution is helpful for my system as configured. eval(ez_write_tag([[250,250],'voltguide_com-large-mobile-banner-1','ezslot_0',137,'0','0']));If you notice the thermostat turning ON only the AC without the fan, you can try doing the following. It’s been working perfectly ever since. Cleanr theme by WPShoppe. Apparently for some thermostats it’s not needed…but for the new smart ones, it IS. This feature can, depending on your thermostat model, use two different triggers to decide whether you’re home: the motion sensor on the thermostat unit itself, and the GPS on your phone (a.k.a. If your Nest is at or above 3.7 and your furnace is still cycling, that would suggest the cycling is not due to the Nest turning on the heat to get power to charge the battery. Do you have any similar results with Trane units? eval(ez_write_tag([[250,250],'voltguide_com-banner-1','ezslot_12',120,'0','0']));eval(ez_write_tag([[250,250],'voltguide_com-banner-1','ezslot_13',120,'0','1']));Thermostat is shorted. You are a saint for posting this! In this case, replacing it should solve the problem. I miss the Nest, but am satisfied for now with what I have. If your cycling problem is due to a low battery then the common wire may fix it. BLERG. Thank you for posting this!! They have a 1st Gen Nest controller and I found this article. I wish I had paid better attention to the battery when this was first a problem for me. Similarly, if it’s near a window, the thermostat will register the room as warm. As I said, my furnace was short cycling. The system is not heating when it says it is heating and will randomly stop maintaining heat (almost as if it is not properly communicating with furnace). I appreciate you taking the time to pass along your knowledge!! Occasionally when I would walk by the thermostat it would say that the wiring had changed. Late reply but yes you can terminate two wires under the C terminal screw at the furnace board. Update: Disconnecting the green wire stopped the short cycling, but a new issue has developed. (Supposedly this is due to extreme cold and will work fine once connected in spring/summer?). One last issue was one of the power wires connected to my HVAC wasn’t properly connected. This completely isolated furnace and now both units play nicely on the Nest. In this case, replacing the compressor is a good solution. Sometimes, the wires don’t match the colors. I will, although I’m not in a rush to experiment with it again. Then I either have to restart the nest or turn it super low and then turn it up past the setting for it to kick on. So if I disconnect the yellow wire can I reconnect later in the spring? I performed regular maintenance on both units. My situation sounds similar to many described here but I wanted to clarify what seems to be causing my issue and what the possible fix might be. Outside Temp: 0 Degrees Fahrenheit Depending on indoor and outdoor conditions, this could mean that your system turns on and off every 5 to 10 minutes. I wouldn’t be surprised either way. I tried trouble shooting the issue on my own and then with the Nest support people. You can leave a comment, or trackback from your own site. Can I simply add another C-wire on the furnace for the Nest on top of the current AC unit C-wire? New Nest arrived and we continued to have the same problem. Yeah, that’s what’s so confusing about this. Apparently not… The yellow wire was the fix. I assumed my AC unit needed maintenance and had died or was in need of a repair. I have left the Honeywell stat on, as things are working. “Intermittent” isn’t descriptive enough, but I suppose short-cycling qualifies. Worth a shot to take a look at what wires are plugged into the actual furnace! This time the AC compressor turned on only during the cooling test and stayed on for the duration of the test. I finally just twisted the red and black wires together to actually get the house warmed up while I decide if I want to re-install my old thermostat. Why Nest thermostat is short cycling the AC Why does the Nest thermostat keep turning the AC ON and OFF? Nest Set Temp: 73 Degrees, Scenario: The outside air was in the 50’s (normal temperate northern CA winter). you saved me from freezing!! Sometimes, the thermostat may be defective and would need replacement.eval(ez_write_tag([[250,250],'voltguide_com-medrectangle-3','ezslot_6',112,'0','0']));eval(ez_write_tag([[250,250],'voltguide_com-medrectangle-3','ezslot_7',112,'0','1'])); One indication that the batteries of the thermostat are running low is that the thermostat screen is faded or is blank. 1. If you notice continuity, it indicates a short connection. This seems to be outside weather related, and since the fix is to disconnect the A/C, it is logical that something happens to the outside A/C unit in severe cold that causes the Nest issue. …all “seemed” fine on start-up, the Nest turned blue when I dialed down the temperature to indicate AC cooling was now being initiated, and I heard the furnace fan kick on and checked the vents where I felt cool air started to flow…. You can do the following steps if the AC fan doesn’t turn OFF with a Nest thermostat. God bless you! Saved me from some frozen pipes! I also found that the charge on the unit had run way down – not sure if this was a cause or a result of the rapid cycling. Choose the Heat Pump option. When your heat comes on the thermostat switches power to the white wire from the red wire. On the furnace end we have a dual zone controller that the wires feed to. If you notice that the fan has stopped spinning, the thermostat is problematic and has to be changed. turn off true radiant ( by default is on and with a preheating of 5 hours) and turn off Eco temperature ( by default is 40 degrees ) and this will fix your short cycle on your furnace. Finally they admitted that this maybe caused by the AC unit since Nest uses the Rh and Y1 to charge the battery….If there is no Y1(AC) because in winter the AC is turned off or not activating due to a Safety switch, it will use the W1 wire….and causes the cycling issue. When this mode is permanently ON, the problem is resolved. Replacing with a new one may address the issue. Change the O/B wire orientation. Support thought it might have been the backplate. good luck! The AC fan may not turn OFF with a Nest thermostat due to the fan schedule setting, a power supply to the HVAC system, ora pending thermostat reset. They referred me to a Nest Pro heating and air company (Young’s Heating and Air in Citrus Heights, CA) who solved my problem. Per an earlier post, apparently anything below 3.7 volts is low. It is disappointing as I was looking forward to using the information provided by using the nest. Such a strange problem – but add me to the list of people for who this trick works! Also I’m worried because I’m going out of town in about a week and temps here in the Midwest are in the single digits. I came across your article searching for info on the same problem. Glad I found your post, as I experienced the exact same problem at about the same time! I’ve been having the same issue. Thanks for the article. But now the heat won’t shut off even after it reached the target temperature. Turns out the Nest was defective. You can consider repositioning the thermostat to a location away from the heat source. But does anyone have any ideas or input that could help my situation? If the spinning continues, there may be an internal furnace or stuck relay issue that needs to be addressed. Not sure what else I can try. The main reason why a HP laptop is frozen is because it’s coming out of sleep mode, or because the laptop has a virus and incompatible drivers. Remove the Yellow, and then it has no choice. The difference is my system has a common wire installed. When you combine the Red and White wires by twisting them, where do they go? In such cases, replace the batteries. The temperature difference between the outside and where you have your air conditioner installed could be too high. If not, strip the wire to the desired length. One way you can resolve this is by connecting your Nest to a constant power wire from the furnace. Nest button doesn't click quite right, or the thermostat just won't sit right on the base? eval(ez_write_tag([[300,250],'voltguide_com-narrow-sky-1','ezslot_20',136,'0','0'])); Your Nest may turn ON the fan but not the AC because of a faulty Nest base plate, no forced air circulation, a defective Y1 terminal on the thermostat, a missing C wire, or activated Air wave setting. Check the fan schedule setting to see if it’s set to be always ON. I’m very new to all this. Keep the thermostat in a different location that is ideally away from heat sources such as appliances, electrical outlets, and air vents with warm air circulation to mention just a few. In some cases, the Wi-Fi chip of the thermostat tends to get overheated resulting in incorrect ambient temperature reading. To check if your Nest thermostat is working fine, keep a thermometer near it for a couple of hours and observe the reading. If it’s weak, the Nest has to use more power. Stefen, could you please explain a little more on what you mean by this? So for all of you with the short cycling, maybe look at other symptoms than the Nest. It wasn’t long before I was getting low battery messages. Try a more reasonable thermostat temperature setting.eval(ez_write_tag([[336,280],'voltguide_com-large-leaderboard-2','ezslot_22',121,'0','0'])); eval(ez_write_tag([[250,250],'voltguide_com-leader-1','ezslot_18',131,'0','0']));Although thermostats rarely run into problems, they can malfunction at times. Check the network connection of the thermostat. If this setting is turned ON, it overrides the Auto-Away setting and turns the AC down even when it’s not required to do so. I have 2 nests. I found this article and disconnected the air conditioner wire. 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