I always run the stove top for a few minutes to bleed off any possible air in the propane lines before using the furnace. If your furnace isn’t working correctly, it may start running more frequently. With my old thermostat, I don't remember it … If you notice your furnace turns on and off … How long it operates depends on how cold it is outside. It fine tunes the thermostat on and off cycle so the furnace doesn't run beyond or under the set temperature within two degrees +-. I'm a new(ish) homeowner so I never noticed such things before, but I installed a thermostat, a Honeywell from HD that ran about $60, and the thing turns the furnace on about every 10 minutes and runs it for 7-8 minutes. Having a dirty air filter in your furnace can cause short cycling. Helpful. In milder temperatures, it may run for 10 to 15 minutes. Locate it and spray all around it with WD-40. During thermostat shut off and before back to operation, the blower and furnace would continue to run. After this, it will shut off while your house maintains the heat level. However, a short-cycling furnace will turn on and off in quick successions. Off and on every 10 minutes is way too much. If I try to restart the furnace right after it shuts off it will not start but if I shut off and wait 20 minutes it will start up again and run for another 10-15 minutes. William. When the temperature begins to fall, it will start running again, and continue with that process all throughout the day and night. I turned the Nest thermostat 10 degrees lower and it worked! Only for 20 minutes. It will then immediately turn off, allowing the desired temperature to be maintained. I turned off the furnace, all power to furnace and AC and even pulled the breaker plug to the AC unit outside of the house. When it does shut off the code indicates 3 flashing lights which is a … ... Then, after some time, the outside unit will shut off but the inside keeps running. A furnace that is working properly will start running and continue to do so up until it reaches the temperature you want. It will switch on once the temperatures drop, but this usually takes a while. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout switch will open to halt the ignition sequence and prevent the furnace from heating. The ignitor will light the pilot but it will go out in less than 5 seconds. Posted By: RoyB on 10/06/13 06:15am Almost sounds like a dirty fan sail switch. Furnace burners shut off after 10 mins & won't re-ignite I have a Lennox G16Q75 with an electric spark ignitor where it will initially start and all burners engage for approx 10 minutes or so but then the burners shut down. While a faulty flame sensor will lead to an immediate shut-off, a dirty filter will allow your furnace to run for several minutes and then shut down. The colder it gets, the longer the run cycle will be. When your furnace won’t turn off, because it can’t reach your desired temperature The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature . When this happens, the furnace will shut off after running for a few minutes. Reply. You might notice that the air being pumped out of … What would cause the inducer motor to run for 10-15 minutes than shut off? I waited for 10 minutes to let everything drain itself of power then powered everything on again. A furnace that works as it should will turn on and run until it reaches the desired temperature. After thermostat turns back on and complete initialization, the furnace and blower blower would stop, wait for couple minutes, and start blowing hot … When the temperature furnace runs for 10 minutes and shuts off to fall, it may run for 10 minutes to let drain! Heat level a furnace that is working properly will start running and to. 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