Question about KitchenAid Microwave Ovens
Model # fmv157gs serial #kgb1141137 fcc vg8eamo44kyy my problem is when you turn on the unit it makes a loud humming noise as if the motor was bad and the items placed inside does not heat up or get hot.
Microwave ovens have a diode stack, usually made up of HV Diodes sometimes only 1, if there is 2 one will sit between the 2 connections on the hIgh Voltage Capacitor which sits at the back usually right hand side to the right of the transformer, WARNING: before doing anything, the Oven must be unplugged and the capacitor shorted to earth, unplug one side of the diode and using a multimeter check for short, it should read virtually open circuit, if there is a problem with it it will show a low reading regardless of the polarity of the probes, there is another diode that sits between the HV Capacitor and the oven case (earth) do the same with that, if either read low, replace, then using the multimeter and test between the two connections of the HV capacitor, if reading id low, replace, then check the connections on the Magnatron to earth, not to each other, read should be open circuit any reading, it needs tro be replaced. Hope that helps...Phil
Posted on May 19, 2009
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Posted on Jan 02, 2017
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Good Morning Jim Cole, thank you for your post!
From what you are describing it sounds like it could be an issue within your control panel or door switch. I would recommend having a technician out to properly diagnose your Frigidaire microwave to avoid any unnecessary part purchases. I hope this is helpful. -Matt
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