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Old 10-26-2010, 09:38 PM   #1
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Water comes through the returns of HVAC system during heavy rains. How do I fix this?


My HVAC unit is on the roof of my home in AZ. A few times a year, we get very heavy rains, at which time water pours into my house through the (2) returns which are located directly below the unit in the house. During light or moderate rain, no water drips in the house. My home is 55 years old, and the unit is approx. 2 1/2 years old, 5 ton A/C with a gas heat pack.

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Old 10-26-2010, 10:31 PM   #2
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Water comes through the returns of HVAC system during heavy rains. How do I fix this?


Is the unit fan running when water is leaking?
If no, check all screws installed in access panels on the unit are tight and none are missing.
Check for any screws on the top of the unit loose, tighten and silicone caulk around them.
Is there a fresh air connection on the roof make sure all screws are tight.
Check gaskets on the inside of all the access panels.

If the evap fan is running:
check for clean air filters. If they are dirty it can cause an extreme negative and suck rain water in around loose or dried out access panel gaskets.
are the return air grilles clean.
If there are return air dampers in the unit make sure they are open and if motorized they are operating OK.

Does the water leak only when it is raining?

Check around the unit curb for roof cracks.

After the heavy rain open the fan access panel and see if there is water laying in the bottom of the unit. If it is it may be the access panel gaskets.

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Old 10-27-2010, 09:47 PM   #3
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Water comes through the returns of HVAC system during heavy rains. How do I fix this?


Thank you very much for your help.
The rain water enters my house during the hot summer months of AZ, so I believe the fan is running. I also checked around for lose screws and cracks in the roof, but did not see any. Water only enters the house during very heavy rains. I did notice a small puddle on the floor near a interior block support wall during storms years ago, which makes me think that maybe there is a roof crack.
As far as a fresh air connection, evap fan and access panel go, I'm not sure what to look for to see if I even have them. Any additional help will be greatly appreciated.
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