Question about KitchenAid KCMS1555RSS Stainless Steel Microwave Oven

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Hi, my microwave is not heating and i cannot hear any humming sounds either. I replace a new magnetron already and it's the same. What else could it be? do you think I should replace the capacitor, diode and fuse too?

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I would have started with the diode and capacitor (i.e the least expense) but you can check the diode by removing the input wire and doing a continuity check in BOTH directions. In other words check it then reverse the leads and check it again. It should only read in ONE direction. If it reads continuity in both directions or is open in both directions it is bad and must be replaced. If the diode check out fine then by all means check the capacitor. Just respect the fact it is a large capacitor and can really ruin your day if it is good and has a full charge. (Been there done that!) Take a screwdriver and ground across the terminals several times then note the position of the wires on the capacitor and remove the wires from ONE terminal set. Take your meter still on Ohms ( old simpson type dial meter for this test) and place it on the capacitors 2 terminals. Then rapidly reverse the leads and you should see a momentary jump on the meter then fall off. No jump when you repeatedly reverse the leads then the capacitor is bad. This should solve your problem unless there is a relay on the control board that controls the magnetron power.

Posted on Jan 16, 2010

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Transformers usually go bad very often. You can check the capacitor with meter. Transformers are hard to check with meter. Usually have to have more than 1 Ohm of resistance. Check amp draw to see if it is consuming power.

Posted on Jan 16, 2010

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The magnetron has gone and is the heart of the microwave oven, this part is the most expensive to replace, cheaper to buy new in the long run.

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hELLO THERE
when a microwave quits heating but every thing else is ok normally
investigate these 4 areas

Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
microwave_diode.jpg Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

picturena.gif High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

microwave_magnetron.jpg Magnetron

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(((The fuse is located inside the unit along side the magnetron)))

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