Question about Bosch Dishwashers

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The water in my dishwasher is not getting hot anymore and also the timer has gone haywire, a cycle that used to take approx 90 mins is now taking over tow hours?

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  • Bosch Master
  • 2,605 Answers

Hello,

Welcome to FixYa.

**What I`m about to share applies to Almost all Electronic control B/S/H/ dishwashers. That includes Bosch, Thermador, Gaggenau and Siemens.**


Based on your description I know what the problem is, though you may not like it. I would still start by checking your water inlet temperature, the unit must be connected to a "hot" water supply line. Try running the hot water at your sink tap to insure the cold water is out of the lines just before you turn on the dishwasher.

That is just a suggestion out of courtesy however...

If it is what I suspect, the control, this won't make any difference but it's worth a try. If on the other hand the water is good and hot entering the machine, you likely have an issue with the control as I alluded to.

The reason your dishwasher never completes a cycle or takes an extremely long time, is the control has detected a heating error. Here`s the most likely reason why it has detected the error...


If yours is a mechanical timer model, check the thermostat inside the door panel next to the dispenser. It looks like...

The water in my dishwasher is not getting hot - 7a58b87.jpg

Even if your home water supply appears hot, it's not hot enough and must be heated by the dishwasher to insure a proper clean and dry.

The issue with your dishwasher likely lye`s within`the electronic timer/control, specifically the heater relay solder joint. ( a faulty flow switch, ntc or heater can also cause this, but not very probable ). This is why it runs really long/forever unless you "stop" it or by pressing the two buttons for "cancel".

To repair your unit It will require you to remove the control from the unit and then remove the control from it`s plastic housing and look for a burnt solder contact on the printed circuit board.

93165df.jpg
This will be one of the pins from the heater relay, hence the unit runs on and on ( because it can`t heat to advance or until canceled ) trying to heat the water.

You can also enter a test to check for proper amperage via the use of anThe water in my dishwasher is not getting hot - 80d9748.jpgsuch...

80d9748.jpg

**Further to this, if you or someone you know is proficient at soldering, a lot of times it can be remedied by simply repairing the solder...although Bosch recommend`s replacing the control and I don`t pretend to speak on there behalf nor do I profess to know better. This is just my experience (it work`s) and my opinion (why buy new if one can repair ?)**

**Please disconnect the power before attempting any service to the dishwasher. If you do not feel comfortable attempting this service, call a local pro, preferably one familiar with Bosch/Thermador/Gaggenau, to service your machine.**

Hope this answer`s your question's, let me know if I can assist you further. Thank`s for visiting "fixya" for your repair inquiries.

Please take a moment and rate this solution to it's helpfulness to you and leave a testimony if you're satisfied.

Good luck.

Macmarkus :)

Posted on Sep 01, 2010

Testimonial: "Thanks very much for your advice, i'm probaly going to get someout out to take a look as i really don't want to replace it....."

  • 3 more comments 
  • Mark MacDonald
    Mark MacDonald Sep 02, 2010

    Hello again,



    Thanks for the reply, and you are welcome regarding the assistance. I just wanted to reply to stress how important I think it is if calling in a pro that you call in an authorized B/S/H/ service provider.



    I see all too often a customer employing a tech ( whom may in fact be quite competent in everything they do, yet unfamiliar with Bosch, yet too proud to decline...I don't know the reasons ) to diagnose their appliance only to have it not repaired correctly or many unnecessary parts replaced.



    All authorized B/S/H/ techs. will be well versed in this issue so you shouldn't have any issue with a prompt repair.



    Good luck,



    Thanks again for choosing FixYa.



    Regards,



    Macmarkus :)

  • Frank Boissonneault Mar 02, 2011

    My water tank didn't work well, recently, and hot water would come out cold. We didn't notice at the begining and also didn't realize we could not use the Dishwasher, so we did use it and it obviously didn't wash the dishes well. However, we have fixed the water tank, and even though the water is hot now (tested to 122 F), the dishwasher doesn't heat the water anymore and cycle are extermely long.

    I know you have been very active on FixYa and often mention it could be the "heater relay". What in that case (knowing that the dishwasher was used with cold water) - would it most probably be? Thanks for the help!

  • Frank Boissonneault Mar 02, 2011

    My water tank didn't work well, recently, and hot water would come out cold. We didn't notice at the begining and also didn't realize we could not use the Dishwasher, so we did use it and it obviously didn't wash the dishes well. However, we have fixed the water tank, and even though the water is hot now (tested to 122 F), the dishwasher doesn't heat the water anymore and cycle are extermely long.

    I know you have been very active on FixYa and often mention it could be the "heater relay". What in that case (knowing that the dishwasher was used with cold water) - would it most probably be? Thanks for the help!

  • Mark MacDonald
    Mark MacDonald Mar 03, 2011

    Hello Frank,

    As I've alluded to in my many post regarding this, if it is indeed a Bosch dishwasher it could be an NTC, Heater, Flow switch or the relay in the control panel.

    To speak specifically to your machine, I'd need a model number of your dishwasher.

    Regards,

    Macmarkus :)

  • Frank Boissonneault Mar 03, 2011

    Thanks Markus, the model number is SHX45M05UC (also called Bosch Integra 500)... I think the model number in canada is sligthly different in USA.

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