Question about Microwave Ovens
Sometime the fuse will just blow bcause someone slowly opened the door without pressing STOP or PAUSE first. The door interlock switch at that point will blow the fuse.
Usually the reason the fuse blows is that the HV Diode has failed. You check this with a multi meter on resistance by reading across the 2 terminals AFTER making sure the capacitor no longer has a charge on it by grounding across the 2 capacitor terminals at least 3 times. The diode will read continuity in one direction only. (reversing the leads)
Also the HV capacitor can have failed by shorting out.
The HV Cap should show a jump on an analog meter as you reverse the leads then return to infinity.
Lastly the Magnetron can have failed. (Short)
All of the above are checked using an analog multimeter. Nothing fancy... a $5.00 meter will do the trick.
The replacement fuse will either be 15 A or 20 A. Look at the markings on the old fuse and replace it with a like fuse. HOWEVER... if any of the above problems still exist the fuse will just blow again.
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Posted on May 01, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.
A number of failures can result in the fuse NOT blowing but still no heat:
Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.
If you are interested in doing it yourself the following link will help : Microwave Repair Manual
(**All the above references to tests are found here)
Oct 21, 2010 | Kenmore 63663 Microwave Oven
Aug 03, 2010 | Samsung Microwave Ovens
Nov 06, 2006 | GE JVM1440 Microwave Oven
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