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Thread: Bosch B20CS51SNS side by side freezer temperature problem.

  1. #1
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    Default Bosch B20CS51SNS side by side freezer temperature problem.

    RepairClinic
    Model Number: B20CS51SNS
    Brand: Bosch
    Age: 1-5 years

    Fridge side seems fine, but the freezer temperature is not cold enough at the top of the freezer (ice is melting), but food at the bottom is still frozen. I know someone else here posted the same problem with a different Bosch model, but I thought I'd post to include my own pictures and not confuse whoever is trying to help us. I've also seen other sites where people have the same problem, but nobody ever gets right to the point of fixing it.

    I removed the back panel inside the freezer compartment, and there was some frost on the coils. Note the section of coils at the bottom that is black, and has no frost - is that the defrost coil?

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    EDIT: After I originally type this out, I went back and looked again, and now the coils are all defrosted (I left the panel off). One thing I noticed, just like another post, is that the cap that covers the wall separating the freezer from the fridge is hot. Not the walls inside the freezer and fridge, just the cap that covers it that runs from the top to the bottom, and where the doors seal against when they close. Not sure if that's normal or not.

    EDIT: When I originally looked at it, I tried closing the door switch to force the interior fan to come on, and it didn't. But when I just tried now, it's coming on. Maybe a defective fan motor? It's the one that sits behind the ice maker - I assume this what they call the evaporator fan?

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    Last edited by Relaxo; April 21st, 2013 at 01:43 PM.

  2. #2
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    Default

    It sounds like your evaporator(FREEZER) fan motor is erratic. It's also possible the door switch is not making good contact. When the evaporator(FREEZER) fan motor is not working, try flipping the door switch a few times. If it doesn't turn on it's most likely the problem.
    Evaporator Fan Motor 601067 Order now for same day shipping. 365 day return policy. RepairClinic.com
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    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
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  3. #3
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    Hi Rick,

    Thanks for the reply. So should the fan always be running whenever the door is closed? I was wondering if maybe it was controlled by thermostat or timer, or something. But if it's always supposed to be running, then it makes sense that it would be either the fan motor or the door switch. The door switch consistently turns the lights on and off, so is that good enough to prove it's not the switch? I did try flicking the switch a few times just now when I opened the door and noticed the fan not running - no change, still no fan.

  4. #4
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    Usually, if the compressor is running the evaporator fan motor should be running. On some models the evaporator fan motor may come on just before the compressor turns on but I'm not sure on your model. Bosch refrigerators are not very popular in my area and I've only repaired one so far. I'll see if I can find a tech sheet on your model. The light switch has two sets of contacts in it. One set can be fine and the other burned out and often it's the fan contacts and not the light contacts in the switch that burn out or get too much carbon build up that they don't make good contact.
    Last edited by rickgburton; April 21st, 2013 at 10:25 PM. Reason: Added light info.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  5. #5
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    Sorry, I forgot to update this thread. The problem turned out to be the evaporator(FREEZER) fan motor located under the plastic cover in my last picture - it was only running intermittently, which caused lots of confusion when just testing by holding down the door switch. After pulling the switch and testing it for continuity (turned out OK), I took out the fan and the resistance readings I got were all over the place, so I ordered a new one. A bit of a pain to get to the fan motor, but more tedious than anything because you have to remove so many parts and electrical connectors. Basically, if your freezer section is only cold at the bottom, then it's because the cold air isn't being recirculated to the top.

    Note: I was able to disable the ice maker to prevent it from filling the tray with water that would never freeze.

  6. #6
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    Also, big thanks to Rick (rickgburton) for pointing me in the right direction about checking the fan and switch!

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