Question about Microwave Ovens
Within 2 seconds of "Start" my Kenmore model 721.8943580, manufactured 8/90, beeps, stops, light goes out, and LED display reads "Prob." "Clear", reentry and "Start" bring same error. If hours or a day go by before restart, the unit runs fine for up to a minute or more before shutdown and "Prob" indication reoccurs. Then, an immediate attempt to run the unit again results in the same condition in 2 seconds.
I use this old unit, otherwise in top condition, only for heating water for tea. Spending big money on repair doesn't make sense. Could the fix be as simple as a cleaning? I've replaced bulbs and belts in MW ovens and I'm an experienced do-it-yourselfer with complex appliance and other repairs.
I would bet that the temperature probe socket has some accumulated grease, etc. in it which may be changing the resistance of the contacts, making the control board think the probe is installed but defective.
First, please unplug the oven before you investigate.
The best idea is to clean the probe socket contacts.
You'd need to remove the outer cover, and the probe socket should be located on the right side of the chassis.
If you can cut thin strips of fine sandpaper and work them back and forth between the contacts, that's the best way.
You can plug & unplug the probe while observing the socket to see how the contacts work.
Your socket may be sealed, and that would possibly require you to carefully take it apart. That's a bit of a gamble, as it may crack due to age.
Another idea is to take a wad of paper toweling, hold it with your right hand over the back of the probe socket, and spray contact cleaner or WD40, etc. into the opening of the probe jack from inside the oven cavity with your left hand.
Then plug & unplug the probe several times, wipe any spills and try the oven again.
If the probe unplugs form the control board, you could disconnect it and try the oven.
Let me know how it goes.
Posted on Aug 02, 2008
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