My husband (61 years old) is just learning to cook and was using the oven. Oven is a Kenmore electric range was set to 350 for roasting a stew in a dutch oven. After an hour and a half temperature exceeded 525. Alarm went off and error code F10 (heat run up) was displayed. Could not turn off oven. Had to turn off oven at breaker box. Have repeatedly called Sears (Kenmore Range Model 79092709010) to arrange repair appointment which is covered under extended warranty / master protection agreement. No injuries. No question a fire hazard in a high rise apartment building.