KitchenAid Model KEMS378SSS00, an oven/microwave combination wall unit. The microwave does not heat, though when I try to heat something it feels as though heat is venting from the unit. The unit light turns on, the key pad wokrs properly and the turntable in the microwave spins, it just does not heat food. The unit does not sound unusual or loud.

William Miller

• 9179 Answers
• Posted on Nov 01, 2006

SOURCE: Microwave shutsdown after 24 seconds, does not heat up

Classic symptom of a defective inverter. It it's under warranty, you're probably in luck. If not, expect repair costs of about $120-150. If you can find a servider who will repair the inverter instead of just replacing it, you can save some money. If you or a friend can replace it yourself, you'll really save, assuming you follow safe procedures. You can find my file "safety.txt" via a Yahoo search. It is part # A606Y5X00AP for model NN-T993S and runs $62.83 plus shipping. The inverter can be gotten from Panasonic at http://www.pasc.panasonic.com/epartr

William Miller

• 9179 Answers
• Posted on Apr 10, 2007

SOURCE: Fan stopped working in JVM1533BD microwave

I assume you're talking about the hood fan which ventilates the cook top and blows air through the grille across the top. If so, it's okay to use the microwave with that not working, but if you boil something on the stove, an external fan is definitely needed to keep mositure from going up into the microwave controls. If the cooling fan INSIDE the microwave (behind the keypad) is not working, then you do NOT want to run it unit it is fixed. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383

SOURCE: MICROWAVE OVEN

Bad power diode, bad power capacitor or bad magnetron

Google on 'microwave not heating' and you'll get some sources of information

SOURCE: microwave turntable won't turn

You may have a tunrtable motor or spindle problem..
This info is from GE website..( link : http://genet.geappliances.com/geasearch/Dispatcher?REQUEST=GETSEARCHRESULT

To minimize the possibility of electric shock, unplug this appliance from the power supply before attempting any maintenance or cleaning.

• Make sure the turntable is centered and seated properly. On models with a stirrer motor there is a shaft protruding up through the floor of the microwave. Make sure the turntable is securely fastened to this shaft. On models that turn on a ring with wheels attached, make sure the turntable is seated securely on the ring.

• Check the turntable to make sure it is placed right side up. If the turntable plate is upside down it will drag on the floor of the microwave.

• Check to make sure that there is no food or debris under the "wheels" of the turntable ring. Food can prevent the wheels from moving forward.

• Be certain you are pressing a cook function rather than a timer function.

• If the microwave has a turntable on/off feature make sure the turntable was not inadvertently turned off. Try depressing the turntable on/off pad to re-engage the turntable.

William Miller

• 9179 Answers
• Posted on Jun 06, 2009

SOURCE: Broken vent grille for a Whirlpool microwave hood combination

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

At our Web site, we have a video available showing how to remove a typical grille in seconds.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.