Question about Bosch HBN 430560B / 430520B Single Oven

3 Answers

Bosch oven won't pre-heat/heat with door closed

My Bosch HBL 645 oven intermittently will not heat up with the door closed. If I leave the door open an inch or two it will heat up. Any clue what may be causing this and how to fix it?

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  • Contributor
  • 36 Answers

Hi ,
according to me ,there is some issue with the cables that are connected the heat functionality of oven , because the same happned with my lg microwave , then the tech checked it , it was a cable fault , one of the cable was loose when the door was fully closed microwave was not working but when we leave some space while closing it it was working , so it is recomended if your oven is in warranty the call the company technicans to fix it , plase dont try if dont have expertis on it take help of tech who knows about microwave

Posted on May 24, 2008

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  • Master
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Hi Juliogags,

It seems that your that the sensor in your door needs to be replaced or repositioned. This will require taking apart the oven no doubt to locate and fix this problem. If you want to do it, make sure the power is off before attempting to take it apart from the back.

Let me know if you have any more questions and I will be here to help along the way.

and good luck

Posted on May 24, 2008

  • Benjamin Patri
    Benjamin Patri May 27, 2008

    Were you able to fix this, if so then please give me some feedback by
    rating my solution. If you need any more help, I would be glad to
    assist you, just ask.

    thanks and Have a Great Day!

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  • Bosch Master
  • 19,396 Answers

Some oven has a door sensor, which prevents heating when door is open, evidently this is faulty, you need a service manual to identify and replace the part, If I find something I will post here.

Posted on May 24, 2008

  • Ginko
    Ginko May 24, 2008

    Check also that the problem is not that:
    the oven start warming up then stop before reaching temperature, then it restart after a while once you open the door, as temperature inside cools down.
    In this last case is the temperature sensor inside oven to be replaced.


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