Question about KitchenAid Microwave Ovens

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Microwave doesn't heat & bulb burned out

I have a KitchenAid kbms377gbl0 combination convection oven/microwave. I have been living with the burned out light for some time, but now the microwave doesn't heat up. It seems to work (i.e., turns on, turntable turns, fan operates), but there is a burning smell through the vent and no heat is produced. I think I probably need a magnetron, but I would feel better if I could find a service manual and get some advice before I pull the unit out of the wall.

Thanks, Chris

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  • guttormsson Jul 19, 2009

    Please give exact advice for this model - what are the specific steps I need to follow? What are the Tests to perform? How can I get a service manual?

  • guttormsson Jul 19, 2009

    Thanks - that's what I wanted to hear.

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  • Master
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HI. your diagnosis is correct. this is the result of a failed Magnetron tube assembly. in most cases, the cut-off fuse will save the Magnetron during a current spike. IN this case, the Cut-off fuse has failed. The faint smell of burning circuitry has confirmed major trauma that has occurred in the unit. it is , mostly, isolated in the magnetron area.

It would be wise to inspect the H.V. capacitor for trauma as well. this is noticeable by discoloration around the Capacitor solder mounts. the actual capacitor should be swollen if traumatized by the voltage spike. if the capacitor, visibly, looks ok and, the shape is not compromised, this will rule out a combination issue concerning the Capacitor and magnetron tube assembly.

**(Although recommended, it is not necessary to inspect the capacitor if you have a functioning microwave with no heat. most models will be totally inoperable if the H.V. capacitor has failed. If the microwave is operational but, there is simply no heat, this will confirm a functioning capacitor(HV)


Concerning the service manual. I have searched for reasonable priced replacement parts and, the actual service manual as well. there seems to be a shortage of repair parts for this particular model. Kitchen Aide has also discontinued the actual print of the service manual you seek as well.

The actual listing price for the replacement Magnetron is $140.00. that hard part is actually tracking it down for purchase. Your model number has been discontinued.

Posted on Jul 19, 2009

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  • KitchenAid Master
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To start check if there is a D on the display, that will indicate demo mode. Unplug appliance or trip circuit breaker for ten minutes to reset the appliance, that can fix minor problems.

If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.If turntable is not running check also the door switch.

The diodeand capacitors can be tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, evenif power is off.Capacitors can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts and diagram, Enter model number or contact the seller here to purchase parts.

Posted on Jul 19, 2009

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