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Old 12-13-2008, 02:21 PM   #16
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Bryant 376 CAv


99% chance the heat exchanger is cracked. There has been lots of problems with them cracking. When the blower is on it will force air thru the crack and force the flame out the front and trip that switch. That is exactly what it is there for. Used furnaces are always risky and I suspect that one is shot. Or the heat exchanger is plugged with soot/rust. Almost impossible to clean. Either way it is unsafe.


Last edited by yuri; 12-13-2008 at 02:24 PM. Reason: add info
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Old 12-13-2008, 02:44 PM   #17
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Bryant 376 CAv


Yuri,

Can I replace the heat exchanger? I noticed something I thought was odd - I put my hand up to the air intake to see if there was suction there, and it was like the fan was blowing air out the intake -not as much as as was coming out of the outlet, but noticable. Is this also a sign of a cracked heat exchanger?
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Old 12-13-2008, 02:49 PM   #18
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Although they can get weak.
As above, it may also be that the heat exchanger is cracked.

Reset it, and watch teh flames as the blower starts, see if they change.
Its an indication of a cracked HX, but not a guarrantee.
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Old 12-13-2008, 03:44 PM   #19
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The heat exchanger is probably made of individual cells and is a very nasty difficult job to replace. Watch the flame carefully B4 the fan comes on and put a stick thermometer by the rollout switch. Should read under 100 degF. Will start rising quickly after the fan comes on and pushes fire/heat towards the rollout switch. The flames should start getting distorted also.
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Old 12-13-2008, 04:40 PM   #20
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Thanks guys. I really appreciate your help. I can run the furnace with the covers off / possible cracked heat exchanger without fear of fire or explosion?
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Old 12-13-2008, 04:48 PM   #21
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NO! Removing the cover delays the time it takes for the rollout switch to trip. All the excess heat will now roast the wiring and cause more trouble. Your insurance company will rip that unit apart and find the problem if there is a fire. Don't use it!
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Old 12-13-2008, 05:36 PM   #22
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Plus the potential for Carbon Monoxide poisions.

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