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790.42003605 Kenmore pro electric built-in oven keeps showing power failure error code

jphale6

Premium Member
Joined
Oct 18, 2021
Messages
4
Location
El Paso
Model Number
790.42003605
Brand
Sears Kenmore
Age
6-10 years
Does anybody have any information on a Kenmore pro electric built-in oven model number 790.42003605. The issue I am having is the oven will shut off and give you the error code of power failure Even though the oven has not lost power
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,797
Location
Murray, Utah 84107, United States
Sounds like a loose connection somewhere. Unplug the machine. Disconnect and reconnect all the connectors on the boards. Does this happen when the oven is in use or when it's off or both?
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,797
Location
Murray, Utah 84107, United States
OK, a loud humm is usually associated with a transformer. You have one on the power board and one on the relay board. If it is a transformer that's humming that's probably where the problem is. P5 on the relay board is L1 IN from the power board. Use a pencil and touch the eraser to each transformer and you can feel the humm. To get a PF on the display the L1 circuit opens at some point either on the power board or relay board.

Update: This might help
 

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