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Bosch HBN 642 -- single oven cycles and doesn't get above 325

I own a 7-8 year-old Bosch wall mounted single oven, HBN 642 A UC.

Problem 1: in bake convection and regular bake mode, oven would operate fine when used for shorter periods -- up to, say, 40 minutes. When operating for longer (say, 45+ minutes), the unit would stop heating and would not heat up again until completely cooled down. (I.e., the "heat" light would go out, convection fan would stop, no heat to elements, and unit would cool down, regardless of position of control or temp. switch.)

I attempted to troubleshoot by carefully removing and disassembling the "thermometer" and cleaning the contacts. Re-assembled and re-installed.

Problem 2: Now the unit only heats up to, say, 325, then cycles -- heat on, heat off -- every 5-7 seconds when the unit reaches 325. (Yeah, I probably made the situation worse.) Problem exists in both regular and convection mode, except the convection fan cycles as well in convection mode.

Would you recommend a new thermometer? New high temp. sensor? If a new thermometer is needed, do they simply install without any adjustment to the part?

Thanks in advance for your kind assistance.

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WHAT WAS HAPPENING AT 1ST YOUR HI-LIMIT TERMAL SAFETY OR OVEN TEMP SENSOR FELT THAT THE OVEN WAS GET TOO HOT AND SEIZING OPERATION UNTIL SAFE TEMP WERE OBTAINED THIS IS GENERALLY A FAULTY OVEN TEMP SENSOR. I WOULD ADVISE YOU TO CONTACT A CERTIFIED TECH TO LOOK AT IT AND P.S. DON'T MENTION THAT YOU TOOK THE MACHINE APART MOST SERVICE COMPANIES WILL NOT SERVICE THE MACHINE IF IT BEEN TAMPER WITH BY THE CUSTOMER DUE TO INSURANCE AND LIABILITIES

Posted on May 30, 2008

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http://www.fixya.com/support/r4511800-oven_problems_electric_oven_heating

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