I had a humidifier malfunction many years ago, it flooded the furnace and basement. one big mess.

I disconnected it and forgot about it.

it was one of those rotating pad units, that required my putting the rotating wheel with a foam pad in a bucket.

pad was clgged with a brown crud. a gallon og vinegar would foam up it was a mess.

and even after rinsing the air in the house got a vinegar odor.

be glad that humidifer was disconnected. call a pro if necessary