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Thread: Bosch SHU43 problem

  1. #1
    Join Date
    Aug 2005
    Posts
    4

    Default Bosch SHU43 problem

    I have followed the advice on this forum. Very helpful, but I am stuck. I found the burnt solder joint on the circuit board. I resoldered it. Does not seem to have fixed the problem. The machine just runs and runs.

    If you have a burnt solder joint, do you need to get a new board?

    I measured internal temp. About 160 degrees. So I know that the heater is working.

    I have the clean light always on. Which leads me to a bad NTC, but I do not get the other symptoms on diagnostic that the NTC is bad. It says that the pump will stop shortly after test mode starts. It does not. It just keeps running.

    Anybody have any advice?

  2. #2
    Join Date
    Oct 2004
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    Ontario, Canada
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    12,179

    Default

    Hi,

    If you have a burnt solder joint, do you need to get a new board?
    Most times yes.....esp if under the 5 year parts warranty!

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3
    Join Date
    Aug 2005
    Posts
    4

    Default

    Unfortunately, I am out of warranty.

    Since the heater was working when I measured the temp last night 160 degrees, and it still had the same problem would you think the temp sensor is defective?

    Or should I start by buying the replacement circuit board?

  4. #4
    Join Date
    Oct 2004
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    Default

    A test that may help....

    http://www.applianceaid.com/boschDW.html

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  5. #5
    Join Date
    Aug 2005
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    Default

    I tried the test

    "If NTC probe (f2/f4) has failed (opened), CLEAN light will come on immediately and testing will end shortly after water has started circulating."

    The clean light is on for the duration of the test. But the test does not stop. It just keeps on going.

    That is what I do not understand.

  6. #6
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    Another NTC test....Normal resistance is approx. 50K ohms @ room temperature. Resistance decreases as temp. increases.

    If ok, sounds like new control time.

    jeff.


    http://www.applianceaid.com/
    Appliance Repair Aid

  7. #7
    Join Date
    Aug 2005
    Posts
    4

    Default

    OK, I checked the resistance on the NTC. Temperature of water in bottom of dishwasher was 70 degrees. Resistance was 63.7K ohms. Is that close enough to spec? Or does that mean NTC is bad. I am not sure how big a range is acceptable.


    Thanks for the help!!

  8. #8
    Join Date
    Oct 2004
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    -Sounds- too high to me....might be worth replacing. + or - 5% is usually ok.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  9. #9
    Join Date
    Sep 2005
    Location
    ny
    Posts
    1

    Default

    I have a similar issue - water not hot and runs forever, had to replace the control module cover - then this issue with low water temp and runs forever. looked at the circuit brd and it had a burnt solder joint, reheated but still not running correctly. My delima is do I change the heat or the control pcb firts? Any suggestions are appreciated..

  10. #10
    Join Date
    Oct 2004
    Location
    Ontario, Canada
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    Default

    Hi,

    My delima is do I change the heat or the control pcb firts?
    My guess, control board.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

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