Question about Bosch HBL 755 Stainless Steel Electric Double Oven

3 Answers

Our hbl755 bosch double oven won't turn off. The upper oven looks like one of the elements will continue to heat even when there is nothing telling it to do so. Unplugging the unit is the only way to turn it off now. I have removed the front panel and disconnect a couple of relays but unsure what relay controls what element or what tells the relays to turn on.

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  • foxislandsol Aug 30, 2010

    The link shows product brocures but not service manuals for troubleshooting. Do you have a link to troubleshoot the specific relay or replacement part that would be causing the problem? Its a HBL755

  • foxislandsol Aug 30, 2010

    I am capable of testing with a volt meter and am familiar to what a relay does. I have a wiring diagram that came with the unit. I just don't know what relay is making the inner element on the top oven stay on. There looks to be a relay that is not being used.

  • foxislandsol Aug 30, 2010

    thats the wrong unit. Its a HBL755

  • foxislandsol Aug 30, 2010

    A wiring diagram came with the unit and it shows the Upper element in the top oven is relay K9. There is no K9 on the power board. I need to find out if it is the power board, relay board, or the relay board in the facia.

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  • Bosch Master
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Hi,
The problem with relays welding togetheris not a new one...they are too light for the load on them...after arcing many times to start and stop the element they weld together...
To find the right one look at the wiring schematic and follow thw wires... it would be best to check the relay with an OHM meter to confrim it is bad... in fact by using an OHM meter it would not take long to find the bad one...
You can buy a cheap OHM meter at Walmart for around 20 bucks...

Heatman101

Posted on Aug 30, 2010

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  • Contributor
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Welcome to FixYa
Dear User
Check the oven thermostat for continuity in "off" position. If the circuit is closed then the thermostat is bad.
Here is the Breakdown Diagrams click here..Hope you got it..Thanks for connecting FixYa...

Posted on Aug 30, 2010

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  • Bosch Master
  • 12,061 Answers

Hi, well the only thing that can cause this is a shorted controller switch, or a faulty controller, sometimes it can be the thermostat, jammed on,or even a jammed relay, or relay driver.
However to have even a remote chance of a DIY repair one simply MUST obtain a service manual, this shows you how to troubleshoot and isolate a problem for repair. As many Symptoms may have widely differing Causes.
As a professional, I always advice that one should seek a professional, usually it ends up actually being fixed, and cheaper in the long run. Plus there is NO chance of electrocution.

below is your Bosch service link, you can get a manual from here or arrange for a service call.
http://www.bosch-home.com/us/bosch/customer-care.html

Posted on Aug 30, 2010

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For all Free appliance repair videos visit our VIDEO TUTORIALS 1, If the Bosch fan motor in the back of the oven is going round and the temperature light is on (normally little red light), but there is no heat then you will probably need a new oven element, these are generally very easy to fit and readily available from our website these can be tested with a electric meter.
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