Water under furnace unit after heavy rain


  #1  
Old 08-12-17, 07:27 PM
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Water under furnace unit after heavy rain

When we have heavy rain I get a lot of water under and around my central air unit. I opened it up to determine if the issue was internal, but the inside was as dry as a bone, even the drain pan is completely dry. The condensation pump is doing its job correctly as well, so that was eliminated from being the issue.

I had thought previously that the water was coming from the back door flooding, but I caught it tonight and the doorway was dry, but the unit was wet all around.

Any ideas what could cause water to appear all around the unit, but the inside have no sign of water?

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  #2  
Old 08-12-17, 07:51 PM
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Changed title and moved thread to gas furnaces.

First and foremost... you have a gas furnace with an A/C coil installed in it.
That means you have a flue and possibly a chimney.
That's where I would check for the water.
 
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Old 08-12-17, 08:13 PM
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I have both a flue and a chimney, but no signs of visible water on the flue. I suppose the heavy 3 hours of rain this evening and the wind could have provided enough movement to put plenty of water under the very basic flat chimney cap that has been on the house since purchase.

I guess step one is to get up on the roof tomorrow and get the measurements for a quality replacement cap.
 
 

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