Dishwasher Drain Pump: How to Test?

I have the same problem you had. I am not sure of the proper impedance you should have. One internet repair place says 200 ohms for a good motor. I did the same thing you did (same problem - dishwasher not draining) lines were clear to disposal - I also exercised the check valve which is in the 90 degree black elbow right off the drain pump on my machine (Whirlpool model WDF760SADM) forward and backward to ensure it flowed and would stop flow in the reverse direction, which it did. I do not have leads that are compatible with the motor to check that it runs. I am going to replace the drain pump to see if that is the problem. Also, the jerky motion on the impeller is due to the magnetism on the motor.

my dishwasher isn't draining.

I checked the drain hose and it's clear enough that I could blow air through it.

I removed the drain pump, model #W10158351B I measured the resistance

between the two connector pins: 24ohms.

I connected the two leads to

a 120VAC supply. The impeller would turn maybe 2-3 degrees and stop,

with the motor making a hum. I did this with the polarity only one

way (randomly chosen).

I think this is pretty conclusive that the motor is dead but I'd like to be sure before I buy the replacement.

I'm also surprised to find water has been leaking out of the pump bit by bit. I presume that means water has made it past the impeller seal and is generally bad?

Is my drain pump bad? Are there other tests I should perform?

Thanks!

·OTHER ANSWER:

my dishwasher isn't draining.

I checked the drain hose and it's clear enough that I could blow air through it.

I removed the drain pump, model #W10158351B I measured the resistance

between the two connector pins: 24ohms.

I connected the two leads to

a 120VAC supply. The impeller would turn maybe 2-3 degrees and stop,

with the motor making a hum. I did this with the polarity only one

way (randomly chosen).

I think this is pretty conclusive that the motor is dead but I'd like to be sure before I buy the replacement.

I'm also surprised to find water has been leaking out of the pump bit by bit. I presume that means water has made it past the impeller seal and is generally bad?

Is my drain pump bad? Are there other tests I should perform?

Thanks!

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