Question about Bosch HBL 755 Stainless Steel Electric Double Oven
When the oven is on, and for a while after it has been on, it makes a humming/rattling noise. It does not do this on the convection setting and it is only the top oven.
It is likely that the convection element is burned out and needs to be replaced. If all other functions are working then this is the place to start. Teh back panel inside of the oven can be removed by removing the 4 visible philips screws on it. The element should look smooth and round, if not then it needs to be replaced. Be sure to turn power off to the oven before replacing it. Remove the screws that fasten the element to the back wall and gently pull the element away from the wall an inch or so. the wires will be exposed and can be unclipped from the element do not let them fall inside of the back of the oven or you will have to remove the oven from the wall to get at the back panel. Install the new element in the reverse procedure. If the element looks good then it will have to be tested with a multimeter to verify that it is still good before proceeding to check the selector switch for burn marks.
Posted on Mar 11, 2007
If it is fan assisted then check the fan element, it is located behind a panel at the rear of the oven compartment.
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Posted on Dec 17, 2008
ensure that your convection fan is turning
a hum on this model usualy means that the convection motor can seize up a bit
sometimes all you need to do is redjust the fan blade
Posted on Oct 13, 2009
It is most likeky that the fan bearing is worn and thus causing the rattling sound. You will probably need to replace the fan. Check first that there is no obstacle in the way of the fan rotating.
Replacement of the fan will require the back of the oven to be removed giving access to the fan unit, which will need to have the wires disconnected and the fan assembly unbolted. Fitting is the reverse.
Always remember to switch off the power before working on electrical equipment.
Posted on Jan 07, 2010
The good sign is that the motor works fine as do heaters. If the operator interface acknowledges feature selection by beeping or what have you, we can safely say the problem lies with the control board or relay.
Posted on Aug 19, 2010
SOURCE: 30 " Convection wall oven
F2 During BAKE
Control senses oven temperature above 615F-630F
If actual over temperature condition occurred: Look for welded relay contacts on bake or broil relays. If this happens, replace oven control (also called clock or ERC).
If no over temperature condition occurred: Look for a high resistance connection or any other cause of high resistance in the oven temperature sensor circuit. Check sensor, sensor harness and sensor harness connection at sensor and oven control. Replace sensor if found defective.
Remember: Oven control (ERC) measures resistance of sensor circuit , not actual oven temperature. F2 During CLEAN C ontrol senses oven temperature above 915F-930F If actual over temperature condition occurred: Look for welded relay contacts. If this happens, replace oven control (also called clock or ERC).
If no over temperature condition occurred: Look for a high resistance connection or any other cause of high resistance in the oven temperature sensor circuit. Check sensor, sensor harness and sensor harness connection at sensor and oven control. Replace sensor if found defective. Check door lock switches.
Remember: Oven control (ERC) measures resistance of sensor circuit , not actual oven temperature.
Posted on Nov 26, 2010
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