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Hi, I have a kenmore dishwasher 665.13213k900 and the thermal fuse keeps blowing. It is located on the control board.

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Old 08-23-2013, 08:35 PM
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Default Dishwasher keeps blowing thermal fuse on control baord
Model Number: 665.13213k900   Brand: Kenmore   Age: 1 - 5 years   

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Hi,
I have a kenmore dishwasher 665.13213k900 and the thermal fuse keeps blowing.
It is located on the control board.
I have replaced this fuse 3 times and it will last between 30 and 60 days and then it will blow again.
I used the pigtail harness when replacing the fuse.
I ran the diagnostics and it/I found no problems Heated Dry->Normal->Heated Dry->Normal
Is there something else I could check to see why it keeps blowing?


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Last edited by devitojj : 08-23-2013 at 08:41 PM. Reason: gave location of thermal fuse
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  #2 (permalink)  
Old 08-24-2013, 09:38 AM
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Check your electrical connection at the junction box and make sure you have a white to white black to black and a ground wire hooked up. Then ohm test your heating element make sure it's not shorting out it should be 50ohms or less typically. Then take a an amp clamp multimeter and after turning on unit measure the amperage on the heating element wire while in diagnostic it should be around 7-8amps if it's not your having a problem with the heating circuitry in your unit. Also pull out your unit from the cabinet and inspect the complete harness thoroughly for any burns, brakes, or open wires. Good luck
http://www.youtube.com/watch?v=lZCP55aScvI
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Old 09-02-2013, 08:48 PM
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Hey thanks for your help, I had to wait for the long weekend to fix this dishwasher.

I ohmed out the heating element and got 13.7 ohms. I also found the schematic inside the lower floor plate. This schematic said that the heating element should be between 10 – 30 ohms. So I am ok there. The junction box wiring is fine.
I noticed that the heating element wires ran up to the control board and I looked at the connector and found that it was melted slightly and the PC board was discolored from heat. The only reason that there would be heat being generated at a connection is if the connection was not a good one. If the connection is a little loose then it acts as a very low ohm resistor and at 8 amps that would generate a lot of heat. So I cut off the connector and re-crimped on new 3M ¼” female spade connectors that have a plastic protection around them. They are good for about 220 degrees and 30 amps. After doing this I put the dishwaser back together just enough to turn it on and I connected an amp meter at the thermal fuse and got the following readings running the diagnostics cycle:
1st time heater on 1.7Amps
2nd time heater on 8 amps

I also measured the temperature at the new connections I made and it never got over 98 degrees. This is the area where the relays are for the motor and the heating element so the temp reading was coming from this area. The area where the thermal fuse is was only 88 degrees.

It seems to be running fine now at least for 2 days. I currently have a 10 amp fuse in place of the thermal fuse because those dam things are like $25
I ordered a new thermal fuse and it should be here this Friday and I will put it in and remove my 10 amp fuse.

After reading about this problem all over the internet I don’t understand why whirlpool or someone else can’t just tell everyone with the same problem that the real problem is the connector for the heating element. It should not melt. If it is melting at the connector then the connection is no good.

I wish I new the schematic was in the bottom plate the first time I change the fuse. I might of found the melted connector at that time.

I will post back in a couple weeks if the dishwasher is still running fine.
Thanks for your help
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Old 09-22-2013, 04:39 PM
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Default Still working

ok it is now 9/22/2013 and it is still working.
So the problem was just a loose connection going to the heater element that caused the thermal fuse to blow.
Just cut off the factory connector and crimp on new connectors.


Maybe someone should call Kenmores engineering department and let them know there connectors stink.
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Old 09-24-2013, 07:00 PM
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They already know it and Kenmore makes nothing it's a brand name sold at sears. Whirlpool is the manufactures of this and they know they have wiring harness/thermal fuse problems. When you buy the thermal fuse that's why they come with a piece of the wire harness that goes to the main board the the door switches. The contacts in this are loose or become bad over time and cause the thermal fuse to blow or wiring to spark or cause other issues because it arcs over in the connection and is not a good contact or loses contact over time.

Last edited by HumboldtRepairMan : 09-24-2013 at 07:02 PM.
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