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How do I change clogged tubing from my sump pump that runs up through the furnacoutlet?

0 votes
I have a sump pump that is attached to the furnace in the small closet that contains the furnace. It is a heat pump/ AC. The AC fan portion is outside on the back patio. I have lived in this town house for 21 years. I was layed off recently so my 22 year old son an I were trying to fix this leaking problem ourselves. We know to unplug it and over the years I have cleaned out the pump per instructions on the pump and replaced or cleaned the PVC Pipe that runs into the sump pump. All that appears to work fine and I might even replace the sump pump but can't figure out how to replace the thin flexible tubing that is coonected to the side of the pump and runs up thru the furnace and out thru the top somewhere and then down into the pipe that the washing machine hose empties the water from the washer into. I've pulled that out of the washing machine drain and it does drain but mostly leaks out the bottom of the furnace into a bucket I have underneath it. The more the AC runs, the more it leaks and misses the bucket and I'm sure is causing water damage. Right beside the furnace closet is a larger closet in the kitchen with a washer and dryer in it. Thanks for any help you can give me.
asked in Heating and AC by debcaudill007 (120 points)
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1 Answer

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Hi Debcaudill007,
If removing this old tubing from the furnace and from wherever it runs through seems to be a problem (tubing inaccessible, stack inside the furnace assembly, ductwork, etc.) I wouldn’t touch it at all. Disconnect the old tubing from the pump and cut the exposed sections shorter to get them out of your way (condensate pump and sump pump ends), purchase some new tubing and run it different way, so it is accessible for servicing and you can see any possible clogs inside of it.
However, since I don’t know your installation details / positioning of the furnace and other surrounding it items, I’m not sure if this will be easy / possible to install. Also, since the tubing is discharging condensate and there’s still leakage from underneath the furnace / air handler there might be another problem. Since your unit is older (as old as the townhouse?) there might be an internal problem / corroded / overflowing condensate pan located directly inside the “A” coil. 
Coil’s location depends on the configuration of your system… so it might be above / below the furnace if mounted vertically or on its side in horizontal installations. PVC tubing that runs into the condensate pump is connected to that tray / pan so you’d have to get access to the compartment and check its condition.
Let me know if you have any other questions, just click “comment” below.
answered by darekrudy (21,730 points)