New HVAC Drain at Home

This is what happened when HVAC wasn't installed correctly in the attic results in overflowing and dripping into downstairs living space.

Issues/Mistakes were:

#1 The HVAC drip pan was not connected to the drainage pipe - this is the dumpest thing ever!

#2 Because the HVAC is on the attic floor (and not elevated a few inches), drainage slope is not steep resulting in slower drainage.

#3 The existing drainage pipe for the HVAC was placed underneath a piece of plywood (instead of on top).  This creates a little hill in the drainage pipe where it bends back up before exiting the attic.  This created a backup in drainage to the unit, which overflowed the internal drip pan into the unit and the backup drip pan.

#4 The water sensor malfunctioned/burned out (and therefore didn’t activate to shut off the unit automatically when it detected water in the drip pan).

Resolution:

#1 Reconnect the drip pan to the drainage pipe.

#2 Replace the drainage pipe to correct the hill, so that gravity can flow naturally.

#3 Replace the water sensor for the drip pan.

Definitely no HVAC unit above the living space - do you don't need to deal with dripping ceilings and fixing water damage in your bedroom.