Bosch HBN 442 / HBN446 Electric Single Oven Logo
Posted on Dec 10, 2007
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Bosch HBL 645 Convection Oven -- No Heat

We have a Bosch HBL 645 Convection Oven that is about 5 years old. There is no heat. This model has a red lamp on the control panel to indicate when the heating elements are powered -- that lamp does not illuminate. The timers and clock all work OK. The convection fans start OK, The interiror oven lights are OK. The power input voltages measure OK. A schematic would be helpful, but I cannot locate one and there isn't one in the owners manual nor the installation manual.

Any assistance would be greatly appreciated.

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  • 2 more comments 
  • BillB604 Dec 11, 2007

    I looked at SAMS publications -- its been years since I looked at one of their books. Nothing found about Bosch ovens.

  • BillB604 Dec 11, 2007

    Oh, and this is an electric oven. I've checked the power circuits - they measure OK.

  • Anonymous Mar 30, 2014

    push buttons

  • Anonymous Nov 28, 2021

    Hello BillB604. I have the exact same issue with my HBL 446 model where the heat indicator does not illuminate when the oven is in bake or broil. I see this issue was solved for you. Do you recall what the fix was? Thanks!

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  • Posted on Dec 11, 2007
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Goto this site for a manual http://www.samswebsite.com/. sounds to me like the heat/control board may be bad.Is this gas or electric?Youll have to find out if you have power coming out of the heat board.The thermostat could also be an issue,let me know ill try to track down a schematic for you.

Devabhakthuni Venkateswara Rao

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  • Posted on Dec 11, 2007
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First out put voltages measures,when output voltages ok , then see the control circuit.after tnat every thing ok. replace heating elements.

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