Guessing the AC wire is active and keeps the Nest powered in that mode. Tough to say whether the low battery was the cause or the symptom. Our kids rooms always run colder/hotter than the rest of the house, so this gives me peace of mind that they aren’t too cold/warm at night! You can do the following steps if the AC fan doesn’t turn OFF with a Nest thermostat. The thermostat is most likely missing out on a C wire connection. Remove the Yellow (Y1) wire and tuck it away safely. Lack of a common wire of not enough power may make sense. Next, I decided to test and see if installing a “C” (common) 24v power would help. I replaced my indoor fan, thinking its a blower issue and still doing the same thing. So if I disconnect the yellow wire can I reconnect later in the spring? This is only a temporary solution for when it’s insanely cold. I didn’t read every post so apologies if this is a repeated solution. Always consult with a trained electrician or technician. I did have a low battery light, but only noticed it the morning after all of this started. I don’t know what any of the codes on the wiring harness mean (ie W1; Rh; blah blah), and it could be we wrote down the connections wrong from the previous thermostat. I have old in-wall HVAC units and this solution worked! Check if the AC unit is low on refrigerant. Thank you so much! I wouldn’t be surprised either way. So an update to my Nest experience since installing it in January 2018 and having the furnace short cycle, to then finding this thread to solve the problem (lifesaving, again-continued thanks) by rewiring during the winter to get us through and then the C wire addition to solve the problem and have the AC work.. It also has return air and discharge air temp sensors, an outside air temperature and if I as the RedLink will have the same internet functions. I checked the battery though and it’s above 3.7. It’s pretty easy, I followed this guide: https://dengarden.com/appliances/Save-Money-Fix-Your-Own-Furnace. I appreciate you taking the time to pass along your knowledge!! 2. Please let us know if the new Nest helped! The hope is that the process does not start the AC compressor. ACs are located on the ground outside by each other. And, voila. Apparently for some thermostats it’s not needed…but for the new smart ones, it IS. While waiting for a reply from my wife as to the whereabouts of our old thermostat I came across your article. 28 VAC and the nest has a full battery. If you experience the hot airflow, the problem is with the thermostat. When your furnace is cycling on and off, it's called furnace short cycling. This was the second time in 8 months this problem happened. Therefore, the thermostat is likely to sense that the room is already cool and will turn the AC OFF. God bless you! 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. It was cold leading up to the failure so the heat had definitely been running (and probably charging the Nest). You can try the steps given below to resolve the issue. 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. I had read this post at one point and was convinced it was something wrong with the Nest, but I finally tried cleaning the flame sensor and it fixed the problem. Luckily this post was up and the suggestion worked perfectly. It fixed everything. The outside air was in the 50’s (normal temperate northern CA winter). Nest thermostat has power issues. Ryan Duell. The development of current and future products seems to be lack-lustre. 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