• ** 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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JENN-AIR microwave model: JMV9186WP0 Thermal Fuse?


Premium Member
Jun 8, 2015
Las Vegas
Model Number
Hello, I have a JENN-AIR microwave model: JMV9186WP0 and the appliance seems to work fine for 1-minute increments. I have experimented with trying to boil water with a voltage monitor plugged in. Line voltage is 120VAC and under normal operation the voltage drops to 117-118 volts. If you set the timer for 1 minute seems to work fine, but set it for 2 minutes the Magnetron cuts out and the voltage returns to 120 volts. Could this be the Thermal Fuse?

Fan motor coming on when cooking?....this should help draw air across the magnetron to help keep it cool.
Mag does have a thermostat to shut it down if it gets too hot...

Thermostat-W10598693-01023299.jpg Fixed thermostat

Gee, I never really thought of that :-(

Ok dumb question; How can you tell if the fan for the Magnetron is running whit the unit mounted in place.

It’s almost like clockwork, you set the time for 2 minutes, and at 1 minute the Magnetron cuts out..
If you are referring to the squirrel cage fan, yes it does come on with microwave..

On your style, that is the one they use to draw air across.
If no vent restrictions and the fan is working, might as well then try the thermostat.

Your welcome, keep us posted as to how the repair went.


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