Question about Air Conditioners
First recommendation. Turn off the furnace, and buy some carbon monoxide detectors. I definitely do not recommend you using the furnace without them.
Yes, the heat exchanger can be replaced.
No, you would not want to attempt to braze the holes.
If the HE is cracked or has holes, it needs to be replaced. That can kill you.
They are usually removed by disassembling 90% of the furnace and part of the cabinet. This is a major repair, and not a do it yourself issue unless you have some experience and training in the operation of furnaces and electrical controls.
Also be aware that your HE may be under warranty depending on the age of the unit. Most are 10 year warranties. Some are even lifetime.
Posted on Dec 14, 2008
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