My 10 year old over-the-range Kitchenaid has always worked perfectly. But a minute into making my oatmeal this morning, the fan got much louder. Five minutes later, the bell rang, and my cereal was still stone cold.
There can be a couple of problems that cause the fan to get louder. 1 is that the Diode assy has failed that controls the power circuit of your magnetron (RF) The 2nd is the magnetorn itself may have failed. (If this part has failed it is cheaper to just replace the unit in most cases) These are the 2 most common failures. In a 10 year old unit replacing the diode is a minor expense and worth the repair cost. The diode can be resistance checked with the power off and one terminal disconnected. The Ohm meter set on resistance should only read in one direction. If it is either open or shorted in both directions then the diode has failed. Without a model number is it difficult to state exactly where the diode assy is in your unit. Most of the time they are located either on the bottom INSIDE of the chassis or on the chassis inside the back panel.
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