I don’t buy into the explanation that it was the colder-than-normal weather. TL:DR your 3rd gen Nest may require the “C” wire to work properly with your HVAC. Just an update – we spent 2 hours on the phone with Nest, they believe our base is faulty so are shipping a new one. 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. Hopefully this is helpful to someone else…similar issue with heat pump short cycling for both heat and AC, ended up calling a Nest pro specialist out. That’s all. Your Nest may not be cooling because of incorrect O/B wire orientation, a bad or bulged capacitor, a non-working condenser, or if the thermostat is defective. Nest Set Temp: 73 Degrees, Scenario: Well, make sure it’s fully charged. If your heat comes on after shorting the red and white wires together and is no long short cycling, your thermostat is likely the problem. It’s loud and it doesn’t heat anything. Might save them a few phone calls. I checked my red to black C voltage. Make sure that the wire isn’t bent and the copper wire is exposed by about one-third to half an inch. Check the HVAC system for a blown-out fuse and do a replacement if needed. Give that a try and that way you dont have to mess with cooling leg “Y”? I don’t know why that one works and the other didn’t (other than different furnace brands). I find it curious that a number of us seemed to experience this at the same time though. Furnace went right back to normal. We made note of where the previous wires were connected to old programable thermostats. Changed the furnace filter but no help. By anticipating the \"flywheel\" effect of a space heating up, it turns off the burners a short period before the space reaches the desired temperature. This completely isolated furnace and now both units play nicely on the Nest. You can follow any comments to this entry through the RSS 2.0 feed. “Intermittent” isn’t descriptive enough, but I suppose short-cycling qualifies. Next, I decided to test and see if installing a “C” (common) 24v power would help. I am located in NY and this week we are having record breaking freezing temperatures, last night was 8 degrees I was all set to go back to old thermostat, then came across this article, have no idea why nest support did not tell me about it, but I did send link to the support person that was helping me. This could make the thermostat interpret that the house is warmer than it is. The author of VoltGuide.com is not a trained electrician or technician. So I am not sure. The Nest thermostat may short cycle the AC due to low level of refrigerant, a missing C wire, or a faulty thermostat. Which is a nice gesture and one I wasn’t actually expecting. So I decided to replace it with a Nest 3 generation thermostat. Hi. This is likely to help address the problem. Reverse the O/B wire orientation by following the steps mentioned in the “Nest thermostat turns on AC instead of heat” section. Even after factory resetting the Nest the problem still persisted however and I began looking for my old thermostat, assuming the nest was just DOA at this point. The Certified Nest Professionals came out, replaced the Nest a 2nd time but still don’t know why this is happening. Often, this connection isn’t present in most thermostats. It is a 3 wire unit (Blue/Rh; Green/G; Red/W1). You can do this by following the steps given below.eval(ez_write_tag([[300,250],'voltguide_com-large-mobile-banner-2','ezslot_2',127,'0','0'])); If the above steps don’t work, switch OFF the power connection to the heating and cooling system. Ryan Duell. It’s been working perfectly ever since. The temperature difference between the outside and where you have your air conditioner installed could be too high. I had this same exact problem! they can be a noun and a verb). 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. Hey all. It seems there are 3 issues here: December 31, 2020 - 5:35 am My walls are all closed up now, so I have no hope for running any additional wires. In my case this wire was blue. In the summer of 2018…, Now here we are, in summer of 2019, and I change the Nest setting from Heat to Cool, after having turned on the AC power switch from outside and flipping the breaker to on, to supply the power from the circuit panel…. I came across your article looking for a solution, please update if you get more answers. I should have bookmarked it…. If the spinning continues, there may be an internal furnace or stuck relay issue that needs to be addressed. Why does the Nest thermostat keep turning the AC ON? I did have a low battery light, but only noticed it the morning after all of this started. It is 37 degrees F. It was in the negatives just days before this. Sorry, your blog cannot share posts by email. I’m dubious of their explanation, which leads me to question whether they’ve really thought this through, or they’re just grasping at straws. Yes, I totally agree. link to Why Is My Lenovo Laptop Freezing? They have a 1st Gen Nest controller and I found this article. eval(ez_write_tag([[250,250],'voltguide_com-leader-4','ezslot_10',140,'0','0']));eval(ez_write_tag([[250,250],'voltguide_com-leader-4','ezslot_11',140,'0','1']));The tips given below can help to solve the problem of the Nest thermostat not turning ON the AC compressor. So for all of you with the short cycling, maybe look at other symptoms than the Nest. Then the heat/fan would run for a couple of minutes. We had a cold snap here in Toronto, Ontario and my furnace was short cycling. Depending how many thermostat you have open anyone on Nest app go to settings of top right open it . I went with a Honeywell IAQ setup, which seems to be perfect for situations like mine… I switched the thermostat over to the common, the IAQ interface was easy to wire to the furnace. Clearly, the thermostat is working fine if the yellow wire is not connected, so I don’t see how reconnecting it and then installing the shunt resistor makes it any better. Replacing the limit switch in March worked then – but like I said it failed again about Christmas time. So a third limit switch was installed, but still short cycling continued. So after a day in dual mode, SB’s solution above works! Woke up to a freezing house this morning and the nest was basically just short cycling the fan off and on (furnace was not coming on). God bless you! We have a Carrier gas/forced air with dual zones (2 thermostats, but only 1 Nest). Similarly, if it’s near a window, the thermostat will register the room as warm. I see there’s a few different theories but no definitely solutions so I may pursue working with Nest’s tech support to see if there’s any more permanent resolution but at least for now I know I can go to sleep without turning in to a popsicle over night. Sometimes, it may be the AC converter fitted to the AC unit that is defective and needs to be changed. I performed regular maintenance on both units. 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. This time the AC compressor turned on only during the cooling test and stayed on for the duration of the test. I tried to remove the Y1 wire but I get an error code. 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. You might want to check if the base of your thermostat also needs a replacement. This option can be found under the Nest Sense setting. We don’t have A/C so there was no yellow wire to remove. Remove the Red (Rc or Rh) and White (W1) from the thermostat. No disconnected wires necessary. It was cold leading up to the failure so the heat had definitely been running (and probably charging the Nest). Hopefully this will help someone else too. this may explain the issue http://www.marco.org/2011/12/17/nest-incompatibility-without-c-wire I’m hopeful (luckily I live in Texas and not somewhere super cold), but this is a bummer for sure. So as long as the Yellow wire was connected, even if it was supplying less than ideal current, the Nest base wouldn’t switch over to Red. The information and guides on this website have been sourced from various forums and other unverified sources. They fixed that also. They referred me to a Nest Pro heating and air company (Young’s Heating and Air in Citrus Heights, CA) who solved my problem. The furnace technician traced it to a faulty hi-limit switch. So, I replaced the downstairs thermostat with a Nest thermostat, only to encounter the issue with short cycling. I ended up tinkering, but couldn’t make any progress. 2) White Rodgers • 90-380 Replacement Heavy Duty Switching Fan Relay SPST 1-NO , 1-NC 24 V Coil. I am not sure your solution of changing the wiring configuration will work for me. Came across this post while I was on hold to talk to Nest’s tech support. This problem could be mainly because of the wrong wiring connection. It went into a seemingly infinite short cycling loop on January 3rd. 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. I’m working on my dad’s thermostat and the temp outside is 38… doesn’t seem cold enough to be problematic. The system turns back on and begins to hear after I manually adjust…it looks like it has returned to 72 degrees. You can try to fix a Nest that’s not heating by following these steps. I have the exact same problem. If the temperature reverts to normal, the Wi-Fi access point is responsible for the heat generation. The Denver area was hit with near and subzero cold and I was visiting my daughter’s family. It solved the problem. It doesn’t make much sense to me.). The boiler is on for longer at lower temperatures. Disconnect the white and red wires from their base terminals. 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. This is a good time to check for a refrigerant leak as that can also affect the compressor. It wasn’t long before I was getting low battery messages. I was thinking perhaps my AC nest may communicate to the heat nest and shut down because diff areas of the house may be hotter or cooler. Although I have a heat only system with two wires. Just wanted to say I’ve had this problem pop up on three separate occasions now, during ‘polar vortex’ type weather events where outside air was less than 5F. 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. I used a little vinegar on a piece of cloth because I didn’t have any cash or sandpaper handy. Hi there, Can someone provide some guidance….. We received and installed two nest (3rd gen) on boxing day. When removing the wire didn’t work I started poking around inside my furnace’s control box. If it is not there, it might be worth getting a C wire connection done. So it’s now January 2018 and we just installed a Nest E, and ran into same cycling issue (and the customer service still just recommends releasing the Y wire). Why does the Nest thermostat keep turning the AC OFF? I have a C wire and the charge is shown to be 3.9v but the furnace will still only run for a few minutes at a time, turn off for a few seconds, and then begin again. If I remove the yellow do I have to tape it or cover it? The only difference I have in my setup was that I removed a jumper between the two Rs as per the directions from nest. Pulling out the AC (Black or Yellow) solves the problem until the summer…..So it gives me some time to install a Common Wire to see if this will fix it. Stefen, could you please explain a little more on what you mean by this? Our 2nd gen Nest went out too during the recent cold snap here in Colorado. .. And here I am, a new Nest Gen3 owner, just installed it tonight and it is and has been verrry cold out here in Toronto for many days now… My Nest has been short cycling for hours until I found this post… It was getting cold in here. Remove the Red (Rc or Rh) and White (W1) from the thermostat. It’s a common configuration, but if yours differs, you may have to do a little more digging. Update: Disconnecting the green wire stopped the short cycling, but a new issue has developed. We’ve had a Nest for over a year and today I noticed the furnace short-cycling. The system was short-cycling for some unknown reason eval(ez_write_tag([[300,250],'voltguide_com-leader-3','ezslot_9',125,'0','0'])); When the Home/Away setting isn’t enabled, the Nest thermostat is likely to turn the AC OFF. 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. Late reply but yes you can terminate two wires under the C terminal screw at the furnace board. It’s been several hours now and everything seems to be working well. I located an awesome website that comprehensively covers “smart” thermostats. Apparently not… The yellow wire was the fix. As I said, my furnace was short cycling. Any ideas or further info? In some of my Googling, I recall having come across another note on a problem not unlike this one, and someone commented that they thought there might be a priority as to where the power is pulled from, and that Yellow came before Red. Mine didn’t even look visibly dirty so I didn’t think it would help, but it did. It’s pretty easy, I followed this guide: https://dengarden.com/appliances/Save-Money-Fix-Your-Own-Furnace. Good luck if you need pro help in Massachusetts call walsh plumbing salem ma 9783043956. And we can be warm again! A faulty base plate is one of the reasons that triggers this problem. Thanks for the yellow wire advice. Regardless, removing the yellow wire solved my short cycling problems. I took a look at my furnace, and the C wire is wired but goes to the AC unit outside. If I find out anything else, I will be sure to post. After numerous phone call to nest support, replacing thermostat with one nest support sent me, having my oil burner company come in and try to figure out short cycle issue and battery drainage I came across this article. Do you have any similar results with Trane units? Take the thermostat off the base. Nest is now working fine. I have the same setup (AC/Forced air/Nest meets polar vortex), my furnace was cycling and I disconnected the yellow wire and it worked like a charm! 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. But being the weekend, calling them only resulted in receiving their pre-recorded message indicating they are not open. But the Nest is supposed to help with energy as well. It was freaking cold. 31 Dec 2020 See if the furnace works. I was having a similar issue upon installing my 3rd generation Nest. It’s -30 in Chicago today and my furnace kept short cycling and our house was freezing. My previous upstairs thermostat kept saying low battery even after replacing the batteries. Hi AirTech, I’d be very interested in hearing what you figure out – I recently moved into a home with a Nest thermostat and after 3 days I awoke to a terrible noise coming from the furnace and witnessed the blower actually catch fire. I shorted red to white and the furnace ran normally. I’ve gone through charging it to see if it would work and it doesn’t. With his help and the help of Nest phone support I was able to get everything back up and running. What terminals is the resistor going across? I am waiting for another limit switch to be installed. As a temporary solution, while I waited for my replacement, I hooked my W1 (furnace) to Y1 (cooling) and turned the temp down. Otherwise the AC won’t turn on once temperatures really get up there. Or at least did it on mine. Disconnect the Yellow wire in extreme cold weather fixes it for me. In this case, replacing the compressor is a good solution. In some cases, turning the schedule OFF and then ON again solves the problem. Here is the site —-> “http: // smartthermostatguide.com/no-c-wire-install-a-nest-thermostat-at-your-own-risk/” <—- You will need to remove the spaces before and after the "//" in order for the link to work. Furnace is heating but after it turns off keeps cycling Fan On/Off continuously. Upon finding this thread I tried removing the Y1 just to see what would happen. (I’m paraphrasing–I take no responsibility for their explanation! 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. But then I had the same problem with the downstairs thermostat. In some cases, the Wi-Fi chip of the thermostat tends to get overheated resulting in incorrect ambient temperature reading. I have 2 nests. … I went outside to look at the air conditioner and noticed the fan was not working, was not spinning at all. Worth a try if you have a gas furnace and none of the Nest troubleshooting helps. And I can't imagine why any mechanism intended to prevent the Air Handler from killing itself would allow it to short cycle on a 2-3 second interval. Cleanr theme by WPShoppe. I moved the kiddos into the one room in the house with baseboard heating, and called a service technician in the morning. This fall I decided to get it working and forced my way into the bottom of the furnace(turned out to be a bit rusty). Winter is here folks (in the North, anyway). I’m not sure I buy the solutions in the comments of return air issues. If you experience the hot airflow, the problem is with the thermostat. Therefore, the thermostat is likely to sense that the room is already cool and will turn the AC OFF. No power to the R wire? I read about putting in a common wire but couldn’t find away into that part of my furnace and I had to work on other things. Always consult with a trained electrician or technician. But does anyone have any ideas or input that could help my situation? When happens I OFF the next using my Mobile App and start again. I’m out $14,000 and am afraid to stay in my home. And, I can run the fan independently…, Downsides, it doesn’t ‘auto learn’ my schedule – though I found with the Nest I ended up setting up a manual schedule anyway… and the ‘auto away’ feature which I’m not sure if there is a sensor for the Honeywell to replicate…. Get the base plate of the thermostat replaced. So what’s happening? I have left the Honeywell stat on, as things are working. I don’t not have a common wire hooked up to it. I have been a certified web designer for 17 years. No short cycling or error codes. …I noticed the Peak Saver timer/power interrupter outside, did not show the power light as being ON. This call for power is meant to be brief and undetected, a tiny “pulse”, but some systems are very sensitive and see the Nest’s small power draw as a call to turn on. So I got to thinking some more, and thought as a test, to determine IF the AC unit was faulty AND/OR the Peak Saver timer unit was to blame, I would reinstall my old non-wifi, oldschool thermostat to see what would happen. The suspicion was for some reason the Nest was not compatible with my furnace control board, and that was causing the limit switches to fail. Thanks for the article. http://www.marco.org/2011/12/17/nest-incompatibility-without-c-wire, http://cafbit.com/entry/nest_learning_thermostat, http://support.nest.com/article/Technical-Info-Tour, http://minnesota.cbslocal.com/2017/12/26/nest-cold-weather-glitch/, https://dengarden.com/appliances/Save-Money-Fix-Your-Own-Furnace, ELEC 460/860 (LabVIEW Programming) at the University of Nebraska, Resolving a Locked Library When a LabVIEW Class is Really Only Loaded in One Application Space, Copy and Paste from LabVIEW to Other Applications, Furnace Short Cycling with Nest Thermostat. It is a 4 wire unit (Blue/Y1; Green/G; Red/Rc; White/W1). Thank you! Hope this help. Ultimately they admitted that this problem has now developed….and requires a “Common” wire to be installed, which they are willing to reimburse. I was ready to take a hammer to my Nest after waking up to (or coming home to) my furnace short cycling multiple times with no clear rhyme or reason for it. I’ve been through the low batter fiasco in the past, this is not the problem. Did you ever find a solution? After lots of diagnostics and trouble shooting, ended up with incompatible Furnace and AC. Finally, after no luck with the Nest support lines, I decide to shut off the heat from the app and re-turn it on to 72 degrees. The explanation that it was working with the Nest, you agree to terms... Which wire does what – so I would say low battery fishy to me. ) fox problem! Up there not spinning at all, but my Nest thermostat was checked... 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