You might have helped your friend out & you just might have helped someone die. A cracked heat exchanger is nothing to play with! Yes you found a faulty switch that was causing an issue but did you scope that furnace to find the crack the technician saw? Heat exchangers are condemned by visual & it doesn't matter if it's just a hairline crack.
Around here that furnace would have been disabled (like that one was - but more completely) and red tagged. Gas co would have been notified to cut the gas supply. Youuld have been locked up for messing with it.
What you did was dangerous & illegal. The gas company can't help unless they have a certified HVAC technician who is willing to certify there is nothing wrong with that heat exchanger & the liability is so great that rarely happens.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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