DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Furnace shuts off and restarts back up repeatedly




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Old 02-20-2011, 09:53 PM  
suckassmule
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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



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Old 12-26-2012, 05:59 PM  
j7735
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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



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Old 12-27-2012, 10:49 AM  
tinmantu
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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.

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Old 01-12-2013, 10:00 PM  
jwm02g
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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.

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