Question about Bosch Nexxt 500 WFMC3301 Front Load Washer

2 Answers

Bad smell in Bosch nexxt WFMC3200 washer

I really don't think this washer is so bad as some make it out to be.

It appears to be fairly stout in design.

The gray seal connecting the outer tank to the case of the machine is sort of vulnerable but looks easy to change.

I think I may have stumbled upon a solution to the odor problem in this machine, however.

The outer tank has a short hose going to the drain pump. There is no filter there. The output of the pump goes to a sort of J tube much like an ordinary sink drain. This was filthy in my case. Keep in mind that this machine had odor problems for about three years. It just developed this problem.

The J pipe has a hose from itself to the pump. This was full of nasty smelling stuff. In addition, I discovered that there is a check valve and a small hose going to the top of the drum. I assume this is an overfill protection where water can drain from the drum to the drain if the supply level sensor fails.

I believe that this check valve was stuck and was allowing dirty water to be admitted back into the drum. With this dirty water sitting in the drum, it is not too surprising that the thing began to smell.

Anyone else with this experience? Any hints to help keep it from recurring?

Posted by on

  • Gary Follett Jul 06, 2010

    I meant to say that this machine had NO odor problems for three years. Thus, I know it is capable of operating without smell even without continuous maintenance and without cleaning the drum after every use.

    I was very happy with this machine in every way until this smell issue arose about 6 months ago.

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Check where water might be building up at door if front loader. Mildew will start. On some units free kits were given to repair standing water issues. You can run a small load with bleach (without clothes) to wash away any mildew, however, if there is a drain issue, bleach can also be held back and later affect clothes. If you have mildew in hoses, I would question how water is not being pumped out, is the drain hose higher then the unit itself?

Posted on Jul 07, 2010

Testimonial: "Thanks for the pointer. The drain is a sink feed and its outlet is below the washer top where the pump pushes the water. I really think that the check valve was stuck open and allowed the dirty water to flow back into the drum."

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I have this problem with my Siemens machine, it is due to mainly running low temp washes and bateria building up in the hoses etc. (more prevalent if the machine is connected directly to the sink and not on a stand pipe). I run a 90 degree cycle every 4 weeks with the machine empty except for two capfuls of baby sterilisng fluid (approx half a mug) I buy stores own as it is cheaper than miltons. The first time I did mine I ran the cycle twice to be sure it was cleared out. My machine is six years old and the first smelly signs were when it was about a year old, I run the maintenance wash religiously ever 4 weeks and run a machine descaler such as oust thru every 4-6 months. Hope this helps. Roni. (ps don't be tempted to use bleach as it foams up and can cause more problems!!)

Posted on Jul 06, 2010

Testimonial: "Thank you for this very helpful information. I was sort of thinking there must be some effective means to clean the inner portions of this machine but was unsure what to use. "

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