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the control is the computer for the unit and the relay board sends power. You can check the wires to the sensor from the relay board. Remove power to the unit and look for the purple wires coming off of the relay board. Unplug them and if the temp in the oven is around 70 deg the sensor should read 1070 to 1100 ohm's. This range from Jennaire has had issues with the two board and the wiring between them. I could not pull up your model and used the next one in line. They should be very close to the same. You should also have a wiring diagram on your unit. Check for an envelope on the back of the kick plate or on the wall or celling in the blower area under the unit. If you wind up needing the display board re-enter your full model # XXXXX the sears link below and if they need a series # XXXXX is the first two numbers of the serial number.
Click here for parts at sears Click here for wiring diagram(may not be exact)
Let me know what you find out...
From the diagrams that I am looking at and the manual that you sent, it appears that the relay board is in the back of the range unit. That leads to some additional questions: Are there steps that I must take to be able to move the range to get to the back panel? Do I need to disconnect the blower and the gas? What safety precautions are required?
Also, it appears that there are two relay boards, (# XXXXX & #29). How do I know which is the failed board? Should I assume #29 since that is the one you sent the wiring diagram of?