re: Update - Not a plumbing issue. The coils in my AC are leaking

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Drip pans aren’t tied into the the “main plumbing”. It’s usually just a pvc run that empties onto the ground outside of your house

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the condensate line ties into the plumbing waste/vent system. The safe pan, by code, either needs to have a float switch that will kill the unit if the pan fills up, or the drain line on the pan needs to go to a place where it will be seen notifying of an issue.

you should never have water in the safe pan unless there is an issue.