• ** 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

    Jake

KEMS308SSS05 Microwave is heating only intermittently

eurban

Premium Member
Joined
Oct 23, 2018
Messages
2
Location
east coast
Model Number
KEMS308SSS05
Brand
KitchenAid
Age
6-10 years
Hello,

We have a 7ish year old Kitchenaid combination wall oven / microwave convection oven. Recently the microwave is only heating things occasionally. On the times that it doesn't heat, it sounds exactly the same as the times when it does. The fan comes on and it lights up inside but it simply doesn't heat its contents. Currently its takes 3-4 tries to get it to heat something in the microwave mode. BTW, the convection function for the microwave ovens seems to work just fine.

The door seems to close correctly and pushing it closed while operating the microwave doesn't seem to affect the the issue.

I have tried shutting off the breaker for 15 minutes and then restarting. No change.

I have also put the logic panel into diagnostic mode and there are no codes stored. The microwave door switch seems to operate as it should in the diagnostic mode.

I found the tech sheet for our unit online and I have attached it here in case it will help diagnostics.

I am hoping that someone can point me towards some likely culprits for my microwave's issues. I am able to remove the unit and test things with a multimeter. Any thoughts on where to start??

Thanks!
 

Attachments

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
36,140
Location
Murray, Utah 84107, United States
Put a cup of water in the machine for 2 minutes on high. Does the water boil?
 

eurban

Premium Member
Joined
Oct 23, 2018
Messages
2
Location
east coast
I did as you asked

First, second and third attempts, the water was still cold (zero heating) after 2 minutes. The forth attempt, the water was very hot but not quite boiling. Keep in mind that when new, this microwave was not very powerful. As best as I can tell when it "decides" to work (like my 4th attempt this evening) it heats as well as it ever has.

Also as I mentioned before, you can't tell whether it is working or not until you open it up and check the item. It lights up, runs the fan and shows the count down timer and graphic on the screen regardless of whether it is actually heating or failing to heat the item.

Thanks!
 

xdcai

Member
Joined
Oct 30, 2019
Messages
1
Location
ONTARIO
I have the same microwave with the same problem. Have you figured it out what's the cause? I think the problem may be the MW inverter or magnetron.
 
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