We have a Thermador CM302 built-in double oven. The convection motor assembly in the lower oven emits a vibration-type noise when the convection fan is spinning.
I removed the fan from the spindle and unfortunately the squeal is still there even when running the motor without the fan attached. So the motor probably has to be replaced. I may attempt to do this myself if it is not too difficult.
This brings up a couple of questions: (1) Can the motor be replaced without removing the oven from the wall? (2) Does the motor just plug in to the power supply or is there wiring involved?
Answer Hello Todd. Here are the instructions from the manufacture for the motor 494266. Hope this helps.
1. Turn off the electrical power to the oven.
2. To make servicing easier, remove the oven
3. Remove the racks from the oven.
4. Remove the front screws from the left and
right oven rack supports and remove the
supports from the oven liner.
5. Remove the screws from the convection
baffle and remove the baffle from the back
of the oven liner.
6. Remove the hex nut from the front of the
convection blade. NOTE: The nut has leftrotating
7. Remove the flat washer and e-ring from
the convection blade and remove the
blade from the motor shaft.
8. Remove the screws from the pan and remove
9. Remove the motor screws from the
bracket and remove the motor from the
10. Disconnect the two wires from the fan
11. Connect the brown wire (#45) to the right
terminal of the new convection fan motor,
and the white wire (#44) to the left terminal,
then install the motor assembly.
12. Reassemble the oven.
The wires should unplug, so no rewiring is need.