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Old 10-30-2008, 11:47 AM   #1
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I had 20" of water in my basement recently, cleaned and dried all that I could and the furnace fires and blower works. However the blower will not shut off. I have shut the furnace off but need some suggestions as it is getting cold in Chicago.

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Old 10-30-2008, 06:40 PM   #2
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water probaly got into the circuit board, replace it.

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Old 10-30-2008, 06:55 PM   #3
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Sounds like something is shorted out. Possibly the fan relay is full of water. If this furnace has a circuit board, it could be fried internally. A constantly running blower fan is a way some furnaces tell you something's wrong with it....and obviously being submerged in 20" of water isn't good for it. One of the more important things to be aware of with a water soaked furnace, is the growth of mold. The water seeps into every crack and crevice, and it's nearly impossible to get all of it dried out and cleaned without disassembling the furnace.

A suggestion is to contact your home owners insurance agent and explain the situation. I've replaced furnaces before that were submerged due to a sump pump failure (or the like), and the furnace got soaked. The insurance covered most of the replacement. Its worth checking into.
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Old 10-30-2008, 10:54 PM   #4
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If it has a relay controlling the fan it could be sticking, if you tap the relay if you have one and it quits then you've found the problem. Another thing is the fan switch could be sticking as well.
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Old 10-31-2008, 02:25 AM   #5
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Quote:
Originally Posted by simpleman1962 View Post
If it has a relay controlling the fan it could be sticking, if you tap the relay if you have one and it quits then you've found the problem. Another thing is the fan switch could be sticking as well.

The reley is on the circuit board.
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Old 10-31-2008, 10:13 AM   #6
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I sanitized the furnace with an ozone generator and there seems to be no mold issues. I also got a little bit of money from the insurance company, but not enough to fix everything that was damaged. so I'd like to salvage what I can. I will pull the circuit board this weekend, clean it, tap some relays and see if I can pinpoint the problem.
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Old 11-25-2008, 10:53 AM   #7
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Thanks for all the advice, it turns out that the fan blower control board was fried (highly oxidized). $38 bucks for a new one on ebay and all is good. Thanks again.

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