Step 2 – Check Your Thermostat if Your Furnace Keeps Turning On and Off Repeatedly The second most likely suspect when your furnace keeps turning on and off, is your thermostat itself. With Nest, the indoor fan blower randomly turns off for 3-10 seconds, then back on for few to several minutes. nest thermostat turning fan on and off. Make sure your Nest thermostat is connected to your wifi. Unless the air handler is turning itself off to protect itself, I think my Nest is defective. It just runs your system longer. Turn the fan on or off. Thermostat fan “on” or “auto” setting: what’s the difference between the two? However, after several minutes, it started cycling again at around 2-3 second intervals. So for most heating systems, turning the temperature all the way up won't heat your home faster. 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. For example, to run the fan for an hour: Or at least did it on mine. 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. 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. 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. I replaced my old thermostat, its working perfectly, but only when i use Nest, the Blower randomly shuts off then on.. Your thermostat will also turn off features like Wi-Fi to preserve battery life before it must turn off completely. Had to run a new 18-5 wire downstairs for it as I only had a two wire setup from my previous mercury thermostat. Once the desired indoor temperature is reached, the fan shuts off until the next cycle.. I replaced my indoor fan, thinking its a blower issue and still doing the same thing. 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 So installed a new Nest 3 a couple of days ago. To force the AC to kick on, either on the NEST app or the NEST thermostat itself, turn the AC down to kick on at least 10 degrees cooler than what you want it set at. You should be able to access the nest settings through the app. A thermostat is an on-off switch, not an accelerator. Blog Post. 31 Dec 2020 Depending how many thermostat you have open anyone on Nest app go to settings of top right open it . Thermostats, just like cell phones, computers and other electronic devices, can go bad with time. When turning on, you can specify the length of time you want the fan to run, in seconds. If the thermostat supports a fan, use the SetTimer command of the Fan trait to turn it on or off. Select fan, select every day option and and turn it off. Last night I successfully got the fan to STAY on for several minutes, by having Nest tell it to stay on. I assume that you have the app for the nest on phone or 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.