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Thread: HBL5750UC/08 Bosch Wall Oven. Broiler element comes on / stays on in all cook modes.

  1. #1
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    Default HBL5750UC/08 Bosch Wall Oven. Broiler element comes on / stays on in all cook modes.

    Model Number: HBL5750UC/08
    Brand: Bosch
    Age: 6-10 years

    Bosch wall oven, microwave combo, HBL5750UC/08

    Problem:
    • In any cook mode but off, broiler element comes on and stays on. This used to happen intermittently, now all the time.
    • Eventually the over-temp sensor will trigger and turn it off.
    • Turning oven to "off" will turn off broiler element.


    • Built-in diagnostics (from downloaded service manual) don't show any relevant faults.
    • Temp readings from sensors (again, using built-in diagnostics) seem accurate.
    • Using diagnostics to turn on broil element turns it on, but again, will never turn off.


    All of this leads me to believe it is a stuck relay?

    Question:

    I've seen references to a "control/relay board" and a "relay board". I suspect one of these components.

    Control/Relay board comes up as Bosch part #12022212. This board looks like it has many small relays on it.

    Relay board comes up as Bosch part #00663802. This looks more like a power supply board than a relay board.

    Should I replace the relay board?


    Click image for larger version. 

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    Click image for larger version. 

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  2. #2
    Join Date
    Aug 2004
    Location
    McMullen Valley, Arizona
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    94,709

    Default

    Hi,

    Control/Relay board comes up as Bosch part #12022212. This board looks like it has many small relays on it.
    That's the main relay board you would need, that one controls the heating elements.

    You can order it here:
    Control Module 12022212


    Jake
    Appliance Repair School 1987-1988
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    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

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