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Old 07-12-2011, 08:05 AM   #1
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Air path blocked on furnace


I have a forced-air furnace with an attached AC unit that is acting strangely. Though it worked fine until recently, air now no longer exits through the outlet ductwork,. Instead, the air is being forced out through the seams at the top of the furnace, just below the cooling coil. It's like the normal air path is blocked somehow. No air flow comes out of the house vents. This is true whether I run AC or just the fan.

What would cause this? Can I fix it myself?

Thanks
Eric

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Old 07-12-2011, 08:29 AM   #2
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Air path blocked on furnace


Immediate advice is to shut it off. I'll let the experts advise but sounds like you have a frozen coil. Your fan mAy cook if you continue to run it.

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Old 07-12-2011, 08:43 AM   #3
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Air path blocked on furnace


Thanks. That was the first thing I did, but I'm not sure how long it was running before I noticed the problem.

"Frozen coil"? What would that be?

Eric
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Old 07-12-2011, 10:14 AM   #4
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Air path blocked on furnace


During normal operation water will condense on the evaporator coil ( like sweat on a glass of tea). Typically the air flow across the coil raises the temp on the coil enough that it won't freeze. If, for example, dirty filters or a dirty coil limits the air flow, this water can freeze turning the coil into a block of ice. Thus little air can get thru much as you described.

As there are a number of other things that can cause icing (low freon, restriction in metering valve, etc) help from one of this sites experts is best. As the air flow also cools your blower motor my post was simply trying to help you avoid compounding the problem.
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Old 07-12-2011, 07:53 PM   #5
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Air path blocked on furnace


Thanks, that was helpful.

Does anyone know how I would fix this? Do I just let it melt and try again?

Thanks
Eric
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Old 07-12-2011, 08:33 PM   #6
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Air path blocked on furnace


defrost with the fan On ONLY...remove the a coil access if you have one ice will drop off onto the heat EX....NG..on restart watch the ice form on the insulated line at the furnace and run out to the condenser...go check the compressor might e ablock of ice....probably not an air problem short of gas clean the fins on the squirrel check the return for suction after defrost with fan only
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Old 07-14-2011, 07:26 AM   #7
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Air path blocked on furnace


Thanks, will do.

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