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Thread: FIXED: B26FT70SNS Bosch 800 Series Freezing Food

  1. #1
    Join Date
    Jan 2017
    Location
    Halifax, Nova Scotia
    Posts
    2

    Question FIXED: B26FT70SNS Bosch 800 Series Freezing Food

    Model Number: B26FT70SNS
    Brand: Bosch
    Age: 1-5 years

    Hello, I have a Bosch 800 Series refrigerator and it has been freezing food. The crisper drawers are the worst culprits, but food will freeze anywhere in the fridge, especially if you put it at the back of the fridge. I spoke to a repair guy a year ago and he mentioned I should tape over the vents at the back of the unit and just leave the two on top open. I have tried this, but it does not seem to help. There appears to be two vents on the bottom of the fridge as well which I have not taped. The compressor seems to be working fine......the unit does not make any unusual noises and it does not run for prolonged periods of time. I have also tried increasing the temp via the digital temp control on the front of the fridge, but it will still freeze things in the drawers and at the back of the fridge. Any thoughts on what could be causing this? The thermostat possibly? I'm sure I will need to get a repair person in, but I would like to have some idea of what the possibilities could be before I am charged to replace 5 things that did not need to be replaced.

    Thank you

  2. #2
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    29,862

    Default

    OK, first remove any tape over the vent openings. That will cause more problems than help.

    The problem is most likely the freezer thermistor Bosch 00618554 Sensor
    It's number 0309 in this diagram:
    Click image for larger version. 

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    The thermistor is a variable resistor that changes value with temperature. You need to know the temperature of the thermistor to check it's value. Use the temp/ohm chart below. The problem I have is Bosch is not a popular brand in my area so I don't have any service information for that machine. There's probably a diagnostic routine programmed into the control. Try to locate your tech sheet. Most common places is under an upper hinge cover or behind the lower grill. The tech sheet will have troubleshooting steps to take. I'll go out on a limb and say if you replace the thermistor, problem solved.

    Click image for larger version. 

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  3. #3
    Join Date
    Jan 2017
    Location
    Halifax, Nova Scotia
    Posts
    2

    Default Thanks

    Thanks for your help. I will replace the thermistor and hopefully that will help. Thanks Again!

  4. #4
    Join Date
    Mar 2015
    Location
    From Planet Mars
    Posts
    762

    Default

    Here is a service manual for that model.Hope it helps.
    Attached Files Attached Files

  5. #5
    Join Date
    Sep 2017
    Location
    Oklahoma
    Posts
    1

    Default

    I am having the same issue. Did you ever resolve your problem ? Did replacing the R Sensor fix it ?

  6. #6
    Join Date
    Nov 2017
    Location
    MA
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    1

    Default

    I'm also having a similar issue. I've replaced the freezer thermistor Bosch 00618554 Sensor as well as the thermistor in the Vitafresh bins Bosch 00650305 wiring harness (contains the thermistor and the harness to connect to the led lights). I know that the upper interior shelf is around 41-44 degrees with the fridge set to 41, freezer set to 0 (normally within 2 degrees). The drawers have been around 30-32 degrees and the deli drawer is measuring in the low 20's.

    The problem usually is worse if it's been humid out and takes a few days for the fridge to adjust back to normal humidity levels. So I'm not sure if this is related to another sensor or if this is the control board not operating correctly. Bottom line is I can't use any of the drawers and hope I don't have to have a repair person come out at $250 per hour (that's what they quoted me a while back to replace the ice maker when the shut off arm broke - Bosch was good enough to cover the ice maker and labor even though I was out of warranty).

    Any thoughts? I know that the vents do open and close, so that control seems to be working, but something just isn't right.

  7. #7
    Join Date
    Mar 2018
    Location
    Covington Ky
    Posts
    1

    Default

    Although this thread is old, I was having the same problem myself, and would like to help out anybody who try's to google the same problem. Had this thread been answered I might have been able to fix my bosch fridge sooner. The problem is the damper is stuck open letting freezing air in the entire time the fridge is on. The repair guy came and replaced the entire damper assembly.

    The part is listed as #301 Parts for Bosch B26FT70SNS/02: Freezer Asy Parts and is called the refrigerator cover 00678777 Cover

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