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Old 07-15-2011, 12:20 PM   #1
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furnace fan won't turn off!

Fan came on with t-stat set to off .. won't stop running.
sometimes makes clicking sound and fan pulses on and off.
Any ideas?
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Old 07-15-2011, 02:13 PM   #2
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We had a similar problem. I actually had to pull the fuse to shut it down. Called my home dealer, they said it was a sticking switch and to bang on the furnace to loosen it up. The out of town dealer told me we had to replace one of the tubes because they rust out and clog the gas line. The next day my furnace worked fine. The only think I can think of is there was some air in the line. After we lit up the stove to cook breakfast the next morning it worked. Do all of your other appliances light? I did take it into the dealer and they said they couldn't find anything wrong with it. Good luck.
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Old 07-15-2011, 07:42 PM   #3
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Just one burning question I just have to ask; Is the thermostat set on "AUTO" or "ON"? Because it will not shut off in the ON mode. I have run my AC like this, and the compressor will cyclew on and off as needed, but the fan will continually run. Randy
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Old 07-15-2011, 09:23 PM   #4
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I think it needs to be in the AU mode automatic.
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Old 07-15-2011, 11:45 PM   #5
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Depends on your particular brand of T-stat installed, but as long as it is in automatic mode, it should turn on and completely off with temp. settings. Randy
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Old 07-16-2011, 01:46 PM   #6
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phantom furnace blower started up again last night ..T-stat set on off (no heat -no AC) and set to auto not on for ceiling fan.
disconnected both wires to T-stat and it continues to run, pulled furnace fuse and it still runs ...disconnected power wire at furnace stopped it.
Resent research has me thinking it is the delay relay is stuck closed.
The delay relay has seperate power going to it from breaker panel to control air flow before and after the fire box is energized.
have to pull unit to get to it-- thank God it's summer.
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Old 07-16-2011, 02:43 PM   #7
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Quote:
Originally Posted by rbarrieau View Post
, pulled furnace fuse and it still runs ...disconnected power wire at furnace stopped it.
How in the heck can a furnace blower run with the "furnace" fuse pulled
There must be a mis-labeled fuse in your fuse box.

If it was me, I'd call the furnace manufacturer tech support.
I bet they have an idea what is doing it.

Good luck!
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Old 07-17-2011, 10:09 AM   #8
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FRom what I have read
The relay has seperate power supply from panel.
It is designed to run the blower before and after ignition to prevent propane and excessive heat build-up.
Thank you for your feed back.
Today I will add another stud next to the door jamb to secure the extended grab handle. Who ever installed it screwed it into sheetmetal with no support under bottom screw, it is starting to open like a can of sardines.
All will be OK next week when I am at the beach for two weeks.
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