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I have the same problem. The part of the knob that attaches to the oven has split. I have repaired it with epoxy and will update this question if it works. I also searched KitchenAid for a new knob and they do not have one. I did locate a knob (part # AP3885089) from AppliancePartsPros.com and have ordered it. It is listed as a Whirlpool part but looks like the KitchenAid. I will update you as to the epoxy repair and the suitability of the AP38 when it arrives. Hope this was of assistance.
We've got the same problem and I just took ours apart.
Bad news: I'm pretty sure it's the circuit board. It's not the timer knob, and I'm almost positive it's not the upper selector knob. Most of the components on the circuit board are only used for the "bake" mode to regulate temperature. The board is marked, "128301 Timer PCB". I looked into whether one can buy a replacement board from Kitchenaid, but it's not on their parts list. If I had to guess, I'd say it's the relay on the board, but it's only a guess. Shoddy components, plus it gets hot in there and "bakes" the board. The little fan in the side isn't part of the "convection." It's for cooling off the circuit board. Don't laugh.
Even worse, next to the thermostat on ours, there's a little rubber insulator that's burnt to a crisp. The connection under this insulator was also loose. It hasn't affected functionality, but it doesn't instill confidence in the design. Kind of scary. Unplug this unit when not in use!
Only a one year warranty. I think we now have an expensive toaster.
check the resistance of the plug by turning the timer and temperature switch, if there's no resistance, open your unit and check the resistance of thermal fuse which is connected to line wire. it is look like resistor..if the thermal fuse is ok then check the resistance of heating element..
I would advise you to call Kitchenaid Customer Service. They would be able to send you a replacement timer knob at no cost. You may simply pull off the broken timer knob, and the new knob will snap in with ease.
Their toll free telephone number is 1800-541-6390.
I've had the same problem. I checked out the Kitchen Aid website, called the toll-free number listed on the site (800-541-6390), and talked to a very pleasant and helpful customer service representative. She said she would be sending a free replacement knob that would arrive in 7 to 10 days. It may sound ominous, but if ya can't fix ya, ya gotta replaceya!