During heating, the limit switch also stays on the watch to keep the temperatures within a safe level. If temperatures dip below a certain point, the limit switch, working alongside the thermostat, requests heating to keep you warm. It’s a small plate with arms that keeps furnace (and indoor) temperature limits, beyond which the switch can call for heating or shut off the furnace. The furnace limit switch is a safety mechanism built into modern furnaces to prevent overheating. What is a Limit Switch, and What Does it Do? Until then, the furnace will stay off.īelow we discuss what causes open limit switches, signs that you have an open limit switch, and what to do when your limit switch opens. If your furnace limit switch is open, you must manually fix the issue. Why would the switch open in the first place? And, even if it opens, shouldn’t it at least self-resolve when you restart the furnace? Although it doesn’t happen too often, it’s one of the most annoying things. Not sure this is helpful, but I don't know the correct terms to convey precisely what i'm doing and what the system is dong.If you’ve never run into a “limit switch open” issue with your furnace, you’re lucky. * mild gas smell for 2-3 seconds when i'm 2 feet from unit * green light changes to red, then blinks 7 times * 3rd and 4th breathing sounds each with 10+ second spacing * green light continues to glow intermittently * no visual changes, another 10 seconds go by * a "breathing" sound for 5 seconds (gas being introduced?) * whirring sound for 15 seconds on upper portion Increasing the thermostats temp setting above current room temperature: * blue flame comes after 10 more seconds (seen from "window")Īttic unit (not working): York GY8S080B16UH11B. * heat coil glows orange for 5 seconds (seen from "window") * whirring sound for 15 seconds on the upper portion * green light glows intermittently on lower portion of furnace Looks different on the inside, with a circular window providing visual confirmation of what's happening with what appears to be a single flame. One unit is in the basement, the other in my attic, so i'm delayed but still working on your suggestions.īasement unit (working): York GY9S060B12UP11H.
Since my situation seemed exactly the same, I followed the guidance you and skip simultaneously gave to him.
I had looked at "no1uknow's" post below and felt my situation precisely met his conditions.
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