suckassmule

Christian, does your furnace run (heat for 10min.) in approx. 1 degree intervals, then shut down, then restart, heat approx. 1 degree, shut down, etc., etc?

If so, it sounds like yours is doing what mine does. I've been poking around looking for answers myself and believe it may be a defective Smart Valve. Seems Honeywell produced a batch of defective valves or built them with defective circuit boards/soldered connections that crack over time and create intermittent and various problems with the flame sensor and/or ignitors within your furnace. I'm not a 100% certain that is what is wrong at this point with mine but I'm leaning heavily towards that being it. I need to pull the cover off the Smart Valve and verify the defective soldering points to confirm and likely will suck it up and purchase a new SV rather than repairing since a few posts have indicated that the re-solder is a temporary fix in some cases and living in Colorado w/ occasional sub-zero weather cannot take a chance of a complete furnace failure.

Hope that helps. It's all I know at this point.

Mule

j7735

hi my furnace wont stay lit it cuts off and the blower motor never turns on only when in ac mode the pilot lite stays lit

tinmantu

from afar, it sounds like the blower motor died and it's tripping out on high limit. Could just be a capacitor. Might be worth a service call if you aren't handy with testing electrics.

jwm02g

Did you ever figure it out? Mine is a gas furnace, pretty new (probably at least after 2000, maybe more like 05 or later). You can hear two distinctive switches when it comes on, I would guess the heat and the blower. But now, sometimes only the first switch clicks, after a min the second one flips, but then immediately flips back of. It's like the heat comes on, but the blower doesn't blow. Then it blows for literally less than 5 seconds, and goes off. Sometimes it flips back and forth several times in just a few seconds. Diagnostic lights show no errors, and changing the filter doesn't help. Haven't tried cleaning that rod yet because I am not sure I could find it.