Appliance Parts
How To Fix A Dishwasher That Won't Drain
by Steve Ash
You should also check the body valve gasket to make sure it is fitting properly over the threaded portion of the piston and nut assembly and replace if damaged or worn.
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On models that use a drain flapper and solenoid, again you should check for any obstructions and verify that the solenoid is getting energized and that there is continuity. Use a multi-meter to make these tests. Check that the linkage operating the flapper or diverter is moving freely and replace any defective parts. On models that have a two section pump, the drain impeller may be at fault. First, verify that the motor is running in the proper direction. If the motor does not run, then check for power at the terminals on the motor. If voltage is not present, then you should check door switches, timer or electronic control as a possible cause. If proper voltage is present, then the motor windings could be open. If the motor is humming, then the problem could be that the drain impeller is jammed or the motor could be seized. If the motor is seized, then the motor or motor and pump assembly will need to be replaced. The electrical checks can be made with a multi-meter.
Disassembly of the pump will be required to determine if the impeller is the problem. The drain compartment is typically located beneath the circulating compartment. Remove the lower rack, spray arm, pump cover and filter assembly to gain access. Inspect the drain impeller for damage or wear and replace if required. Also check that the food chopper is in good condition and not allowing large food particles to clog the drain outlet, and that both the chopper and impeller are turning freely.
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