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Old 01-25-2010, 08:45 PM   #16
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Furnace drain problem


You make sure the pvc outtake is slopping back to the furnace? If its not it may hold water and slowly coming back to the furnace.
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Old 01-25-2010, 09:08 PM   #17
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Furnace drain problem


The collector box is not on "recall". The port where the pressure switch tube attaches gets plugged with sulfur and causes pressure switch tripping problems on some of them. Lennox will supply a new one if less than 5 yrs old and homeowner pays for the labor to install it.
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Old 01-25-2010, 09:18 PM   #18
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Furnace drain problem


keithv51, I feel your pain, I had a bunch of parts replaced on my new furnace before a solution was found. Warranties are only worth so much if the tech can't determine the problem Anyway, below is everything done with my situation, some of which may not have been the issue:
-The main problem was the intake vent was pulling in condensation and flue gas from the exhaust. This occurred because the intake vent and exhaust vent were about 2 inches apart (which is correct) but neither vent was extended out from the side of the house. If you read the vent termination section of the manual, you will see the exhaust vent should be a minimum of 8 inches separated from the intake vent where they terminate (assuming your vents go out the side of the house vs. the roof). So I put a 12 inch extension on the exhaust pipe, and my furnace has worked fine since. Other things to consider with the exhaust termination, is it under a deck or roof extension? The exhaust gas can hang up and get sucked into the intake. If the PVC pipe is in an unfinished basement, the manual suggests you insulate the pipe. You can also put a 90 degree elbow on the intake vent if you have limit space to work with.
So, in my case, what happened was over an hour of so the condensation getting sucked into the intake caused the pressure switches to trip several times until the system shut down (error code 4-3). Do you have a two stage blower? If so, turn off the furnace, crank the heat, after 10 minutes the fan will flip to high mode and two additional burners will kick on. If you are having the issue I had, the pressure switches will flip and the fan and burners will drop right back down to the first stage (you can hear this with the cover off).
-As Yuri noted, the black condensate box was cracked on a seam. I put silicone on it, and they did eventually replace it.
-Some small PVC shreds (from when the PVC was cut) were blown out of the black rubber tubes, this did seem to increase the water drainage at bit.
-They drilled a small hole at the base of the combustion fan and put a drain hose on it. A small amount of water does come out, but those combustion fans are designed to handle some water. I doubt this helped with my problem, as it was done before I figure out the exhaust extension.
Best of luck,
Joe
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Old 01-26-2010, 06:52 AM   #19
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Furnace drain problem


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Originally Posted by yuri View Post
The collector box is not on "recall". The port where the pressure switch tube attaches gets plugged with sulfur and causes pressure switch tripping problems on some of them. Lennox will supply a new one if less than 5 yrs old and homeowner pays for the labor to install it.


I think I will call Lennox later today and find out how come we get the bad Heat TXV and recall on the black box but not you all. We should get the same stuff out of Dallas Texas. It pi@@@ me off when I have to tell customer you just payed 6 thoundsand dollars for new systems but we need more money to repair it.
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Old 01-26-2010, 07:23 AM   #20
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Furnace drain problem


If a customer "just" paid you 6 grand to install the furnace. then you shouldn't be charging them. It should be covered under your 1 year labor warranty.
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Old 01-26-2010, 08:17 AM   #21
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Furnace drain problem


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Originally Posted by beenthere View Post
If a customer "just" paid you 6 grand to install the furnace. then you shouldn't be charging them. It should be covered under your 1 year labor warranty.

Sorry it was like furnace and a/c then when warranty is up you have to pay more. Sorry need to make it little more clear. I'm big about customer happiest.
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Old 01-27-2010, 06:52 AM   #22
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Furnace drain problem


I'm wondering why you would have to pay more when an ongoing problem hasn't been fixed ?
They tried that with my car, there was actually a deductible that was supposed to be paid
I told them they didn't fix the problem, so I wasn't paying them again to try to fix the same problem
They tried the same thing when the warranty ran out
I had all the paperwork shwoing the ongoing issue & that it was never fixed
....stupid problem dashlihts woudl go to bright, but a PIA for nite driving
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