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Old 12-13-2009, 09:35 PM   #1
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Hello
Moved into house this summer and have no idea if previous home owner serviced furnace. I have a few problems that I have recently noticed and would like to tackle on myself as I am handy but don't want to jump into messing with furnace with out doing some home work and thats where you old pro's could lend me a hand..Here is what I notice?

1. Fan is grugling when it kicks in and on.. water is entering from somewhere. I notice there are 4 screws I am sure if I remove these I can drain fan. I want to know what would be causing this and how to correct so fan don't fill up again.

2. WHen thermostat in living room is set on auto to a certain degree the furnance will some times kick in...I guessing some kind of sensor is either damaged or dirty. If I switch termostate to ON the furnance kicks in...Its just on AUTO that it is hit and miss...Came home to and ice box other day as tem dropped and north wind in high gear!

If you can guide me thru each problem (pics too) that would be really appreciated...I want to correct this probelm asap since I have the little one in the house and want to keep the family coozy!

Thanks for your time!

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Old 12-14-2009, 05:09 AM   #2
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Clogged or restricting drain lines.

Dirty air filter, and or A/C coil.

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Old 12-14-2009, 06:14 AM   #3
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Hi Thanks for the reply...My guess is something is clogged. The furnace filter has been changed but I don't think that is cause of problem...How should I proceed further? How would you begin to trouble shoot? Thanks
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Old 12-14-2009, 06:16 AM   #4
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


I'd check the A/C coil. Look on both sides of it. To see if it dirty.

I'd also check the drain lines, and clean them either way.
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Old 12-14-2009, 06:18 AM   #5
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Take those 4 screws out and drain the inducer assembly(the small fan that's gurgeling). Blow out all of the rubber drain hoses .
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Old 12-14-2009, 06:29 AM   #6
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


OK thanks guys...what about #2 I mentioned in post above...do you guys think I have a sensor problem?....
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Old 12-14-2009, 06:32 AM   #7
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Can't tell until you eliminate the things that the sensors sense for.
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Old 12-14-2009, 06:47 AM   #8
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Ok I hear...I will drain fan....remove and clean lines and see where things go...anything else I should do?
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Old 12-14-2009, 05:02 PM   #9
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


First turn the power off and cover all the electrical parts. Get a small bowl and pull the black hose off the bottom of the rubber boot to the left of the ventor motor. That is the place that usually plugs up and spills the water into the ventor motor.
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Old 12-14-2009, 08:39 PM   #10
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


FYI...I also found out that the town use to be on wells so the mineral deposit was high...My guess is that was the culprit...I have yet to take apart - any other tips for me?
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Old 12-14-2009, 08:42 PM   #11
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Makes no difference for the furnace.
The water from the furnace is condensate from combustion. Not from your water pipes.
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Old 12-14-2009, 09:20 PM   #12
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


ok..silly me....So I guess this would be build up over the years? or drain pipe is cloged and excess condensation from combustian is not drained properly?
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Old 12-14-2009, 10:04 PM   #13
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Yep. It happens to lots of condensing furnaces.
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Old 12-17-2009, 05:29 PM   #14
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


You have a rubber condensate collector off of ventor motor at the bottom is a black hose .theres a small white coupling connecting the 2 .its filled w/ crap. clean out.lennox offers a kit to eliminate this problem,its a offset piece of pvc pipi w/drain port above ventor motor. so moisture is drained b4
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Old 12-17-2009, 07:30 PM   #15
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HELP- Lennox Elite Series Furnace # M/N 90UGFA3-75-5


Can you clarify in more detail please!... I want to attempt to clean this up Friday...Walk me through how you guys would do it...Please help this newbie out!

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