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Thread: Bosch B36IT water is leaking 2-3 times per day from the top right corner of the fridge inside wall.

  1. #1
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    Default Bosch B36IT water is leaking 2-3 times per day from the top right corner of the fridge inside wall.

    Model Number: B36IT
    Brand: Bosch
    Age: 1-5 years

    Hi,

    I have an extremely heavy two door built-in BOSCH [B36IT] fridge with bottom freezer drawer. Inside the fridge, water is leaking (2-3 times per day) from the top right corner of the fridge inside wall. I believe the frequency coincides with the defrost cycles.
    I suspect that the drain tube or channel is clogged. So, I opened the inside panels to investigate, inserted a nylon coated steel cable into the drain hole. I pushed the cable as far as I could, probably 4-5 feet into the channel. The cable seemed to meet a solid end and could not go any further. I repeated this exercise for 2-3 times. Then, I slowly pour some water into the drain hole. After about a quarter cup of water, the water overflowed.

    Due to the weight and size of this fridge, I have not investigated the back of the fridge, yet. Removing the bottom drawer appears to be a very difficult task also. I plan to search and gather as much information as possible before attempting to pursue further.

    I watched an online video regarding a Whirlpool fridge. At the back of the fridge, the owner was showing a rubber grommet fitted on the end of the drain tube. The grommet has a very narrow slit opening, similar to a duckbill. It appears that small debris can build up and block the funnel end easily.

    I have some questions for the experts here:
    (1) Does the BOSCH fridge drain tube have a p-trap?
    (2) Do the BOSCH fridges also built with a similar grommet at the end of the drain tube above the drain tray?

    Thanks!

  2. #2
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    Default

    Not familiar with this unit at all but here is what little I was able to find. It does not have a trap. Just a straight tube called a "valve outlet" . My guess is that this tube has some type of internal valve which is similar to , if not the same as, the Whirlpool duckbill setup. When you hit on solid terrain with the cable you just went through the valve and hit the base pan that the tube terminates into. Try flushing the drain with hot water using a turkey baster . Blow compressed air through the tube.

    If those efforts fail then here is the part I would change
    https://www.appliancepartspros.com/bosch-valve-outlet-603959-ap3955374.html
    Item 0415 on the parts diagram

  3. #3
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    Appreciate your advice of using compressed air and hot water.

    I have not tried using hot water yet. Beside using the steel cable, I also inserted a 3/16 tube attached with a small bicycle pump. My pumping of air met some resistance after a few strokes. Do you think the bicycle pump might be too small and lack of pressure?

    Jackofalltrades: your diagram is really helpful. I can see that I will have to raise 0417 (support) from the floor to allow 0419 (glide-wheel) to touch the floor. Can I assume that the support of the back ends are sitting on the left and right ‘tracks’?

    I shall continue to explore and report back here with my progress to share.

    Welcome any additional advice. Thanks all in advance.

  4. #4
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    Have you resolved the issue yet?
    Last edited by jackofalltrades; October 20th, 2018 at 12:09 AM.

  5. #5
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    No, haven’t resolved the leaking problem!

    Have a small fridge to get by. Since not knowing what is behind the fridge and the capacity of the drain pan, I’m reluctant to pour more water into the drain hole.

    I’m waiting for a friend with some muscle to help pulling the heavy thing out. Meanwhile, still hope that some other advice/options might pop up.
    Thanks for asking. I shall report back.

  6. #6
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    Thanks

  7. #7
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    Finally I managed to move the fridge out and opened the lower panels behind.

    It has two separate systems for the freezer and fridge, each has its own compressor and draining. There are black rubber drain hoses and plastic drain pans. The freezer drain tube is shorter and straight, the fridge drain tube is longer and curved like an ‘S’, no filter or valve at the end of each drain tube.

    The draining systems have an interesting design: two plastic drip pans are identical, each has an upright cylinder about two inches tall. Each rubber tube is inserted through a bottom hole of an inverted cup, the tube goes into the upright cylinder and the cup covers the whole thing.
    I have not fully understood the water flow, it probably can be better discussed with a diagram. I plan to take some photos in a day or two, upload it and share with all.

    Hi Jackofalltrades: I looked at the part diagram (2 images) when you posted the link about a month ago:
    https://www.appliancepartspros.com/bosch-valve-outlet-603959-ap3955374.html
    Item 0415 on the parts diagram


    It was very helpful. In the last few days, I could not see the diagram anymore. It says: “This image could not be loaded”. I did not save a screen shot of it, any chance of getting them back again?
    Thanks a lot.

  8. #8
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    I see the diagram when I click that link.

    Clear your browser cache.

    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

  9. #9
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    I could see the part diagram now, thanks Jake.

    Click image for larger version. 

Name:	DSCN2662R.JPG 
Views:	16 
Size:	47.3 KB 
ID:	40468In my uploaded photo 2662R:
    - unplugged black rubber hose is for the fridge, it should be corresponding to part diagram part-0415;
    - plastic tray with uncovered upright cylinder should be corresponding to part diagram part-0410?
    - Not sure about the inverted cup (hooked on hose), is it part-0421?

    There was thick built up of white stuff, I suspect it was mold, around the base of the cylinder inside the cup. It therefore blocked the flow of water. It explains the reason of my unable to unclog it by poking a steel cable into. The bicycle pump blowing of air also could not get through. I am not sure if the commercial expert would use a high-pressure compressor to blow the mold out?

    The interesting design of inverted cup seems a simple way to regulate the water flow, but it prevents attempt of clearing the clog from the top down. Of course, opening the interior of a Bosch fridge proved to be even more difficult.

    After I cleaned up the parts and reassembled them, it seems to work. My issue is considered solved, for now anyway!
    However, I do not know how long (month/year) before the fridge needs to be pulled out and unclogged again.

    Just thinking out loud… have the built-in fridge manufacturers designed some improvement or reduce the difficulty of pulling the fridge out to unclog the drain?

  10. #10
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    I don't know the answer to your questions, because I've never worked on a Bosch refrigerator. I have 30 years working on Whirlpool, Maytag, Frigidaire, GE, Amana.

    Maybe Jack can answer those.

    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

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