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My Kenmore Ultra Wash model number 665 16769000 fills with

water for the 2 min...
My Kenmore Ultra Wash model number 665 16769000 fills with water for the 2 min fill cycle then the wash motor engages for a second and stops working. One minute later the motor will hum for a second but not start. When I press cancel the motor engages and runs the drain motor and the water drains fine. I have taken it apart to check the wash and drain impellers and they are both free of debris. I have also checked all of the electrical connections to the motor the heater and the sensors, all fine. The next thing I checked was the resistances of the motor windings. My main winding has a resistance of 2.8 ohms, the drain winding has a resistance of 6 ohms, and the wash winding has a resistance of 6.1 ohms. These are all in the range that the circuit diagram states they should be, so apparently it is not the motor... What can I check next????
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Answered in 10 minutes by:
9/1/2012
appliancesupertech
appliancesupertech, Appliance Technician
Category: Appliance
Satisfied Customers: 117
Experience: 30 years in the field
Verified

appliancesupertech : specialize in ranges, dishwashers, microwaves, compactors, disposers and range hoods. Sorry your having problems, let me look up some info and get back to you.
appliancesupertech : Ok if nothing is getting caught up in chopper blade, then you have a bad motor.
Customer:

As I stated the motor does engage, the drain motor runs and the resistance to the wash motor and the main winding are in the range they should be... so I don't have any reason to think it is the motor.

appliancesupertech : Sounds like its breaKing down under a load or control voltage could be
appliancesupertech : Breaking down under a load
Customer:

Based on your reply it seems that you are suggesting that either the motor is bad, (which I do not have any indication of), or there is an issue with the "control voltage." What I would like from you is some detailed practical procedures that I can follow to accurately diagnose the problem and repair my dishwasher. Please help.

appliancesupertech : Do you have the tech sheet with wiring diagram? Unless you can wait till Tuesday when I have access to info needed.
appliancesupertech : If you have it, please send me pic or I can get it tuesday.
Customer:

Full Size Image

appliancesupertech : Ok we know the main winding and drain winding are good because it drains. If you put your meter checking voltage on the yellow wire and red-black wire, you should have 120v When it starts to wash. If you get the 120v, motor is bad.
appliancesupertech : If you don't get 120v ,board is bad or yellow wire is open. If you have 120v at board on p10 and p4, then open wire.
Customer:

When the wash cycle begins p10 is at 121.8 v, p3 jumps to 3.7 v, p4 jumps to 13.9 v, and p5 jumps to 5.3 v when I can hear a hum from the motor. When the hum stops p3, p4 and p5 are at a constant 0.3 v.


 

Customer:

When I cancel and the "drain" motor runs p10 is at 123.1 v, p3 is at 2.0 v, p4 is at 157 v, and p5 is at 3.2 volts.


 

appliancesupertech : Always keep black lead from meter on neutral side which is p10 and red lead on p4, you should have 120v. No need to check other readings.
Customer:

Actually I think it is p7 that is the neutral, not p10, and my point in telling you the other readings was to show you that during the wash cycle there is no significant voltage to any of the motor windings and when the cancel cycle should put current through the drain winding, p5 there is instead a stronger than expected surge of voltage in p4, which is actually running the wash motor during the drain cycle... What is next?

appliancesupertech : You gave me a reading on all 4 legs, that does not work no matter which one is neutral. Sounds to me you already know what you are doing. I am here to help, not to get in a contest with you. The botXXXXX XXXXXne is if you have 120 v between p10 and p4, the motor is bad. No or low reading, bad board.
Customer:

I am not trying to get in a contest with you and I am sorry if I gave you that impression. I have never opened up or worked on a major appliance to the extent that I am attempting to with this dishwasher. I am simply trying to save myself the expense of buying a new dishwasher if this is something I can diagnose and fix myself. I have been trying for a week and a half using utube videos and other sites to gain some understanding of the inner workings of my dishwasher. I finally broke down and agreed to pay for the advice of an expert from this site. I do appreciate your help,I guess I have not been asking specific enough questions to get the advice I have needed. When I was checking the voltages I kept the black lead on the neutral (p7) or even against a grounding piece of metal... I will open it up again tomorrow and try it with the red lead on p4 and the black on p10 and let you know what happens.

appliancesupertech : Ok no problem. Just get back to me and we w
appliancesupertech : Will get to the bottom of it.
appliancesupertech : P10 is the common lead, so keep black lead on it to check p3, p4 and p5 with red lead.
Customer:

Thanks. I'll check it in the morning and let you know. I guess I didn't really know how to use my meter....

Customer:

ok, so here is what is going on now when I keep the black lead on p10... When it is in the the wash mode and the motor is making the humming sound p3 and p5 drop to about110 v and p4 drops to about 105 v. When the humming stops all three read 122.3 v. When I cancel and the drain motor is running p3 and p5 have a voltage of 119 v and p4 has a voltage of 54 v.


 

Customer:

When I double checked the resistances from the circuit board from p10 to p3 was 2.2 ohms, p10 to p4 was 6.8 ohms and p10 to p5 was 2.3 ohms (which is too low). So I checked at the motor and when I checked again putting the leads into the clip on the motor I got about the same readings, but when I took the clip off and checked from the tabs on the motor where the clip with wires attaches I got the 6.8 ohm reading for the drain coil that is in the right range.... I have no idea why the clip would change the resistance...


 

appliancesupertech : From the readings you have me, the control board is bad. It's giving the motor wash and drain voltage at the same time. The motor turns one way for wash, then reverse
appliancesupertech : For drain. It's trying to do both and cutting out on overload.
Customer:

Thank you for your help! I just ordered a new microcomputer.


 

appliancesupertech : Your welcome.
appliancesupertech
appliancesupertech, Appliance Technician
Category: Appliance
Satisfied Customers: 117
Experience: 30 years in the field
Verified
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appliancesupertech
appliancesupertech, Appliance Technician
Category: Appliance
Satisfied Customers: 117
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Experience: 30 years in the field

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