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?
whats the model ? and age ?
Could be failed and not cracked, like a plugged secondary giving off high CO readings.
Originally Posted by 6t7gto
thanks for the reply.
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.
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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