I have a client here in the Desert that is having intermittent heating problems with the upper oven. Thanksgiving was a "nightmare" for her in that the oven kept cooling down by itself. She said she set the oven to bake, but by the time it got to 300 degrees it would stop heating and eventually turn off. No fault codes displayed, just a nice return to the clock function. Bottom oven is fine.
I went out to diagnose the problem. I ohmed out the oven sensor at approximately 1100, the proper amount according to the techsheet located behind the control panel. I then ran both ovens at 350 and saw the upper one begin to stall and drop off. It read the proper temperature, but my infrared temp gun showed a decline there. No decline in lower oven. When I saw this I adjusted the temperature up to 400 on the keypad. At that point, the temp had fallen to 302 (according to the display) but DID start to work its way up when I made this change. At about 350 it started to stall out again and drop off, never making it to the 400 level. It never actually "turned off" for me, but my client said that in a few minutes it definitely would.
I do not have a complete model number or serial for you guys. The tag is there inside the lower oven, but the info has been worn down or rubbed off. If you know of another place the model number may be located I would be happy to look.
I just downloaded the service manual that Reg uploaded last month. I see how to access stored fault codes, however, it appears there is no self-test features on this particular unit.
Any ideas or recommendations? Thanks in advance.