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Thread: Cracked heat exchanger
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12-11-2011, 07:29 AM #1
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Cracked heat exchanger
Neighbor had his furnace replaced because service man told him it had a cracked heat exchanger.
I asked if I could have the old furnace for parts.
I just wanted to test the heat exchanger.
I laid the furnace on its back and filled the heat exchanger with water.
Does not leak a drop.
Is it possible to have a cracked heat exchanger and still hold water?
thanks,
david
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12-11-2011, 07:52 AM #2
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whats the model ? and age ?
Could be failed and not cracked, like a plugged secondary giving off high CO readings.
luck dan
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12-11-2011, 09:27 AM #3
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No.
Originally Posted by 6t7gto
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12-12-2011, 06:30 AM #4
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Marty,
thanks for the reply.
david
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12-12-2011, 05:21 PM #5
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BTW it is a lennox 1991
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12-12-2011, 07:13 PM #6
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G20? If so they crack on the back side,first bend above the burners. Usually they'll show a rust line stress mark inside the exchanger at that spot for a few years then it goes all the way through. I have a couple on the first heat exchanger but most are on round two.
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12-14-2011, 05:53 AM #7
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Just like a leak in any piece of metal, the crack can calcify or crust over and not actively leak. A water test is not always definitive.
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