If the thermostat supports a fan, use the SetTimer command of the Fan trait to turn it on or off. It just runs your system longer. I assume that you have the app for the nest on phone or computer. When turning on, you can specify the length of time you want the fan to run, in seconds. 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. Select fan, select every day option and and turn it off. Turn the fan on or off. Or tap the thermostat itself select the settings select fan you should also be able to disable there.Sorry for the slow response time, got called out. I replaced my indoor fan, thinking its a blower issue and still doing the same thing. If your Nest Thermostat is off and won’t turn on, take the thermostat off the base and charge it using a USB cable plugged into a wall charger or a computer. If your Nest Thermostat will turn on but you can’t control it or it’s acting sluggish, try manually restarting it and turn the thermostat off and then back on again. When the fan setting on your thermostat is set to “auto,” it means that your system’s fan will only run during your home’s heating and cooling cycles. So installed a new Nest 3 a couple of days ago. Had to run a new 18-5 wire downstairs for it as I only had a two wire setup from my previous mercury thermostat. Unless the air handler is turning itself off to protect itself, I think my Nest is defective. Blog Post. Thermostats, just like cell phones, computers and other electronic devices, can go bad with time. Make sure your Nest thermostat is connected to your wifi. Thermostat fan “on” or “auto” setting: what’s the difference between the two? Before I installed the nest, the furnace would turn on, run the heat, run the fan for a bit longer, then shut off, and it would cycle quite a bit as my house is old and leaky I replaced my old thermostat, its working perfectly, but only when i use Nest, the Blower randomly shuts off then on.. With Nest, the indoor fan blower randomly turns off for 3-10 seconds, then back on for few to several minutes. Depending how many thermostat you have open anyone on Nest app go to settings of top right open it . nest thermostat turning fan on and off. Last night I successfully got the fan to STAY on for several minutes, by having Nest tell it to stay on. Your thermostat will also turn off features like Wi-Fi to preserve battery life before it must turn off completely. A thermostat is an on-off switch, not an accelerator. 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