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It blows fuse - Whirlpool MH1150XM Convection/Microwave Oven

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Possible there is a short within the circuit.
Please check the following for shorting.
1. Magnetron
2. High voltage Capacitor to the magnetron
3. Transformer
4. Surge filter
5. Electronic panel board.
Get tips from this link. Microwave

Posted on Jan 10, 2013


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the fuse blows only when there is a short and it is overloaded, so check it for shorts before replacing the fuse and turning it on!! once the short is cleared the fuse will not blow!!
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The Interlock Monitor Switch is an added
safety check on the Primary and
Secondary Interlock Switches. If the
Primary and Secondary Interlock Switches
allow the oven to operate with the door
open, the Monitor Switch will blow the

You can get more information about adjuting the interlock switch from this link

sections 7-11 thru 7-12 discuss the door interlock adjustment that will cause the 20A fuse to blow if it isn't set up right. I hope this helps you...

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after blowing the fuse?..what happened next?...did you replaced the fuse and it start running again or if you replaced the fuse, it will blow again?

if it is always blowing the fuse, you may have a shorted diode in between the high voltage capacitor. you could remove that just to test if the fuse would no longer blow and if it would heat.

if it did not blow anymore and it did heat the ffod or water, then you all need to raplace that diode between the high voltage capacitor.

if the fuse did not blow anymore and it is still not heating the food , then you might have a faulty magnetron.

if it still blow your fuse then you could have a shorted magnetron, a shorted diode which is the one from the capacitor to the ground( this is anothere diode besides the one installed between the terminals of the high voltage capacitor) ( don't interchange them, they have different puposes..) or shorted capacitor also.

use a regular ohmeter to test each part...

i hope you can solve your problem with these instructions....

good luck,


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