Quote:
Originally Posted by retiredguy123
It sounds like the drain pan under the evaporator coil has a crack or other type of leak. That is the only source of water inside the air handling unit. There is no water pipe that connects to the air handler. It is probably condensate water from the evaporator coil that is not draining through to the condensate drain pipe.
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This. Common. I have worked on HVAC in the past. However, you can verify by placing a strip of paper around the unit about 2" from the bottom with a magic marker line drawn on it. Once the ink gets wet it will smear. If you get nothing on the paper, then look to the inside. The staining on your filter leads me to the inside.
You can remove the filter and get back into the box with a flashlight and look up inside. Condensation can occur just like on a window sill, but this on an ac unit seems really odd. Either you got major humidity issues in the house coming in by the unit which I think you would see all day long or it's the common drain issue.