Sometimes, running the disposal is all it takes to get the dishwasher draining again. If the disposal unit contains unground food, or food sludge has settled in the drainpipe below the disposal, it can prevent even the best dishwasher from draining properly. The drain hose from your dishwasher empties into the garbage disposal drain. The hose will run to the air gap and then connect to the drainpipe before the P-trap. Air gap to drain: This is the same configuration as air gap to disposal, just minus a garbage disposal.In essence, an air gap is like a dishwasher overflow that prevents air locks in the hose. If the dishwasher drain connection has an air gap, a small cylindrical knob will be installed on the sink’s top to allow air to enter and prevent dirty sink water from draining back to the dishwasher. Air gap to disposal: In this configuration, the hose runs to the top of the cabinet just as in the high loop, but instead of having a tape or chain to hold it in place, the hose connects to a fitting at the back of the sink.Sewer gases can enter the dishwasher and leave a stinky smell if it isn’t. The connection must be before (above) the P-trap on the drain line.
High loop to drain: If no garbage disposal is connected, the dishwasher drain hose should still have a high loop, but it will then connect to the drain pipe.High loop to disposal: In this configuration, the dishwasher drain hose will enter the cabinet from the dishwasher-loop to the top of the cabinet, where it’s held in place with tape, a string, or a chain-and then connect to the garbage disposal.The following drain connections are the most common. Open the cabinet and look at the configuration of the corrugated dishwasher drain hose and how it connects to the sink drain. The first step in troubleshooting a dishwasher that’s not draining is pinpointing the type of drain connection beneath the sink. Determine the type of dishwasher drain connection you have.
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