• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

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Whirlpool Microwave WMH53521HZ0 - Intermittent issue... When we open the door and the interior light will not light...


Premium Member
Dec 29, 2008
Tampa, FL
Model Number
1-5 years
Ladies & Gentlemen: I have an intermittent issue with my Whirlpool microwave... sometimes when we open the door the interior light will not light; at this point I believe (like I said it's intermittent) the keypad is dead. I have opened up the right hand keypad panel; I see there are 2 "interlock" mechanisms (white plastic rotating cams); they both seem to be operating properly in that the rotate when the door is closed and make "contact" with the micro switches (push in buttons)... the bottom microswitch seems to control the fan; don't know exactly what the top micro switch is supposed to be doing/controlling but I can guess. The bottom microswitch has 2 wires; however it appears the top microswitch has 4 wire connection points so I'm guessing its controlling 2 microwave functions; so again guessing now that the top microswitch - one and/or both sides) is FAULTY...? IF you think I'm on the right trail I'm not adverse to replacing the top interlock mechanism and the associated 4 contact microswitch... and the bottom interlock mechanism and microswitch too if it makes sense. Please advise... Thanks! Bob S.

Corrected model number
Last edited by a moderator:
Recheck your model number. I can't get anything to pull up with that one. Be sure to read it off the tag on the machine.
Recheck your model number. I can't get anything to pull up with that one. Be sure to read it off the tag on the machine.

Sorry, fat fingered, typo... Does this help Rick...?

Remove the wires from the interlock switch and check the switch for continuity by opening and closing the door. If the interlock switches test good, replace the control board. This is a interlock switch update kit. It should come with instructions.

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