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You should install a drain to prevent stagnant water from accumulating and hopefully prevent bacteria such as legionnaire or other water borne diseases and most importantly this drain should empty as an indirect waste as per modern codes

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Q: Do you need a drain line on a hvac drain pan?
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Water in home HVAC drip pan?

Water in the HVAC drip pan usually indicates blockage in the condensate drain line and or inside the plenum. Remove the condensate drain line where it attaches to the unit and check for blockages. If no blockages are found in the line or no water drains from the plenum, then open up the access panel to expose the A-coil. Clean out any debris or blockages as needed. Pour Clorox down the condensate drain line and make sure that the line is sloping to the exterior. It may be necessary to blow the line out. Check the discharge side of the drain line to be sure water is flowing. Note: It is recommended to have a licensed HVAC technician service the system to be sure that it is functioning properly.


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Drain line is clogged.


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It does not have one. You have to remove the transmission pan. You will need a big drain pan to catch the fluid.


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