Learn how your appliance is supposed to operate so you can determine if it is malfunctioning.
Ovens and ranges have long had clocks and timers allowing a user to automatically control cooking start and stop times. These were handy features but sometimes prone to failure resulting in cooking troubles.
Mechanical clocks usually have electric switch contacts on their underside which when connected into the oven control circuit allows it to start and stop cooking or cleaning operations. The mechanics of the clock can fail making any timing operation impossible. The electrical switch contacts could also fail just preventing oven use, whether set to a timing operation or not.
Most newer ranges and ovens use an electronic control system to regulate oven operations. While the use of an electronic control allows the manufacturer to program many variations of functions like baking, broiling and cleaning they can also have features like Sabbath Mode which wasn't possible with older mechanical systems at all. Unfortunately the complexity of such systems can make diagnosing problems much more difficult to isolate and expensive to repair.
All of the information in these Appliance Clinic procedures is provided FREE OF CHARGE. No liability is assumed by the author for the accuracy of the contents or damages caused by the use of these procedures.