The gap may need to be cleaned or the drain line below the sink may be plugged.
Dishwasher water comes out of air vent on sink top.
How an air gap works.
In a properly functioning air gap the dishwasher hose attaches to an input on the air gap and the water is expelled out the end.
All you need is a bottle brush and some household disinfecting cleaner.
Remove any loose food particles then clean with the bottle brush as shown.
Plug the disposal into the wall outlet and turn on the wall switch to drain the disposal and sink and stop water from flowing out the air gap.
Gravity pulls it downward into the hose which carries it to the garbage disposal.
Place a bucket beneath the garage disposal if the.
When the gap leaks it is normally due to a kink or blockage in the tube from the air gap to the tail piece drain line below the sink.
Yank the cover off the air gap and remove the snap in or screw on diverter.