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Kitchenaid oven KEBC177KBL0 - faint humming noise

Read somewhere that it might be the transformer. Parts list http://www.searspartsdirect.com/partsdirect/part-model/Kitchenaid-Parts/Wall-oven-Parts/Model-KEBC177KBL0/0593/0125300/W0110016/00005?​blt=06&prst=0&shdMod=KEBC177KBL0 has 2 transformers listed - #5 - part #PART NUMBER: 6610122 ($80) and #10 part #PART NUMBER: 8300642 ($23)

what is the difference between these two parts? How can I find out if one or both are good/bad? Could this be the source of the faint hum? How do I find out? I can hear it - very faint. Know it is coming from oven cause louder when door is open (oven off) and noise goes away when breaker to oven turned off. Hum is not always present and seems to have no relation to when oven has been on or off recently.

What do these do?

What happens if they stop working?

Tags
Wall Ovens , Appliances
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2 Answers from these members:
Fred M
The 9760588 more expensive transformer is for the light while the 8300642 is a control transformer. I suspect the light transformer is the part that is humming. The light transformer has a black and white wire containing 120 volts. Use caution to unplug the range and then try removing the black and white wire from the transformer and see if the noise stops. After removing the black or white wire tape them and sit them out of the way. If you no longer hear anything this this is the bad part. Only the light should be affected. If the other control is unpowered then nothing will likely work. I hope this helps. You can reply with any additional details for further assistance. Remember to unplug the range before accessing and removing any wires.
by Fred M Earned 3,547 community points in Appliances
June 30th, 2012
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Manage My Life
I understand how it can be difficult when it comes to determining the cause of the noise coming from your oven. While you are waiting for your expert answer, I did some research on the unit. I was unable to locate information that would be helpful with regards to your question at this time. Your expert will answer within two business days with detailed information. Thank you for using Manage My Life.
by Manage My Life
June 28th, 2012
Answered in 11 hours
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