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HVAC Water Leak Driving Me Nuts

 
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Old 06-17-2018, 05:44 PM   #1
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HVAC Water Leak Driving Me Nuts


Hi All!

I have an HVAC issue I can't figure out. My 1st floor inside air handling unit is in the basement. It's been filling the pan with water, and kicking off the AC when the float switch trips. I thought it might be a faulty pump (mine isn't gravity draining, drains into a pump and pumps outside). Pump works fine. Then I thought my drip line was clogged. I snaked it, still fills the pan. Next I thought maybe the line is partially clogged. Snaked again and separated the pvc drain piping and put a funnel in line so I can see it dripping, just to monitor. Always dripping when the AC is running, no problem.

I can check on it for days and it doesn't fill up; until it does again.

Then I thought; maybe the pump housing has a slow leak. It leaks out faster than the drain drip, slower than the speed I filled the pump when I find the pan full and manually fill it. Took it out and ran it on a clean surface; no leaks.

Anybody seen this before?

Thanks!
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Old 06-17-2018, 08:35 PM   #2
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Re: HVAC Water Leak Driving Me Nuts


Maybe the pipe from the pan to the pump is bottoming out in the pump reservoir ? Cut the line at 45 deg or secure it up from the bottom of the reservoir.

Addl - you say float switch and pan ? The pan below the unit is a secondary catch pan. How is the primary draining, if at all ?

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Old 06-17-2018, 10:10 PM   #3
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Re: HVAC Water Leak Driving Me Nuts


Is it possible the leak is at the coil? Coil draining proper? Secondary drain either plugged? Open to the atmosphere? Or is there a condensate safety switch on the secondary outlet ?


Is this a leak issue? Or is this a condensate pump issue?
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Old 06-18-2018, 06:15 PM   #4
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Re: HVAC Water Leak Driving Me Nuts


Thanks We Fix Houses! When I got home from work, no new water (not unusual). I cut the 45 and reinstalled like you said tonight and will keep an eye on it.


Thanks FlashHeatingandAir! Would those causes show no symptoms for days and dump the water all at once like this seems to be doing? It does over flow my pan into the floor, which I though was odd since the cutoff float switch seems to be working.

If it happens again, I'll check out the coil, secondary drain and condensate pump.
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Old 06-19-2018, 07:12 PM   #5
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Re: HVAC Water Leak Driving Me Nuts


I have a similar situation, so hope I can hop on this thread.

I'll post a picture of what I have. I know less than nothing about HVAC, it's not my system, just the remodel I'm on and would like to wait until we are closer to being done to get the HVAC guys in.

It's a gas furnace/air handler. No water in the auto float, ez-trap.there is a bit of water under it, but I can't feel any on the pipe above it.

It looks like the box thing on the side is filling up and spilling over. Is tthis a pump of some kind?

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Old 06-20-2018, 09:31 AM   #6
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Re: HVAC Water Leak Driving Me Nuts


Vinyl, it does not appear that water is leaking from the pump assembly. is the safety switch on the pump connected to the system? It looks as if water the water is coming from below the "drop-box" under the indoor coil.


You mention a remodel. Is it possible you have dirty air filters from all the dust?
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Old 06-20-2018, 11:22 AM   #7
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Re: HVAC Water Leak Driving Me Nuts


The box is completely full. I ran it all day, but it was full in a few hours.

I changed the filter at the intake in the house. I will look for one on the air handler when I get there today.

Will dirty filters cause this?

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Old 07-03-2018, 04:36 PM   #8
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Re: HVAC Water Leak Driving Me Nuts


Steve @ We Fix Houses,

Your suggestion to cut a 45 degree angle in the drain pipe where it goes into the pump did the trick. I haven't had a leak in 2 weeks since I did this.
Thanks!
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Old 07-03-2018, 08:01 PM   #9
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Re: HVAC Water Leak Driving Me Nuts


OK good deal...glad to help

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