A problem with the drain hose or drain hose loop is the likely culprit for water drainage problems.
There might be many mysteries about dishwashers, such as how they can fill up so quickly with dirty dishes and need to be emptied so that they can get filled again. But beyond some lighthearted mysteries, there are sometimes some real questions about dishwashers, such as what is causing the dishwasher to fill with water and immediately drain. This is a problem that can often be fixed through some basic troubleshooting techniques.
Drain Hose Loop
The drain hose loop should touch the bottom of the kitchen counter and should be at least 20 inches above the floor to work properly. Some dishwashers require a 32-inch-high loop. Check your dishwasher user manual for specific instructions for the dishwasher model. If there is no loop in the hose or it is less than 20 inches above the ground, bring it up and loop it so that it touches the counter underside. This will help prevent the water from draining out of the dishwasher immediately.
Household Plumbing
If the household plumbing itself is less than 20 or 30 inches above the floor or subfloor, an air gap will be necessary to keep the dishwasher drain working properly. It's possible to install this item yourself, but it may be a project for a plumber or repair technician.
Drain Hose
If the drain hose is over 20 inches above the floor and is looped and the household plumbing is at least 20 to 30 inches above ground, check the drain hose itself. If it is pushed too far down the drain, pull it up and out by approximately 2 inches. This may resolve the problem.
Drain Valve
Check to see if there are any obvious problems with the drain valve on the bottom of the dishwasher that can be easily resolved. The drain valve may need repair or replacement. This may be a job for a professional.
Professional Repair
If all troubleshooting efforts have failed, contact your dishwasher manufacturer for assistance, as there may be a service problem with the dishwasher that requires professional repair
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