My furnace is on lockout! What do I do? Are attempting hitting the reset button. Thats the style of advice tech aid offers if unsure, reboot. If the furnace is locked out due to the fact it hasan error message, resetting it generally fixes it. And what if it doesnt? You would try to turn it off through the breakerand turning it back on. Probably thats the answer if the furnacehas totally shut down. One possible rationale of a lockout is when thefurnace thinks anything is improper, similar to a drop in gas stress or overheating. Correct now, the only thing overheating is meunder my collar, and stressful about how tremendous a gap this will burn in my wallet. Youd prefer a shut down furnace and coldhouse to one that is freezing seeing that it burned a gap in the wall. What would reason it to consider theres anunsafe ? If there is a fuel leak in the furnace, ifthere is a blocked airflow in or lack of ability to move scorching air out, a broken gas controlnozzle or gunk constructed up on the burner, all of these could make it overheat.But the unit is giving us a bloodless shouldernow. The flame sensor or temperature sensor couldbe malfunctioning, reporting an unsafe although nothing is improper. Thats a motive to name in a pro. A further purpose might be a damaged limit switch. I dont even recognize what that’s. If youre lucky, you have an oil fired furnacerunning out of oil. No, Im not, given the cost of heatingoil. Then watch the thermostat subsequent iciness. Too unhealthy it is not blowing cold air, whereI would as a minimum investigate the thermostat because the motive as a substitute of assuming it is an equipmentfailure. It will just be that the flame sensor doesnot feel a flame, so the unit locked out. Light the flame and you can be excellent to go.It’s annoying adequate to need to re-lightan ovens pilot light. The pilot gentle is also failing to gentle upthe burner, which is a thoroughly unique situation. Which is yet an extra purpose to call in a professional. If the warmness exchanger gets too hot, the unitwould lockout. It’s a heat exchanger; it’s supposed toget hot. It will possibly get too hot if there’s soot builtup or a colony of dirt bunnies. And youd as a substitute the furnace shuts off thanhave a furnace hearth. I want this was once anything effortless to repair. If youre fortunate, it is only a really dirtyair filter blockading air drift. Replacing the filter then fixes the furnace. I wager that is where the low fee maintenancevisits turn into fee financial savings.You might invariably easy the air filters andducts your self. Identity as an alternative pay any individual else to do the dirtywork. Youre going to must pay an excellent higherprice for the greasy, smoky and oily work of fixing the furnace if resetting it doesnot fix the lockout..