Question about Microwave Ovens
I have replaced motors for turntables before, and replaced fuses,
and it may be the fuse, but I can't find the model # on the outside
of the microwave.
The model number may be on a sticker on the inside of the cooking cavity. Or it may be on the edge of the door, or on the lip inside where the door closes.
There are three protective devices in most ovens that can cause it to be completely dead. There's a main power fuse, then two safety thermostats. One is on the cavity to shut off power if something overheats, like if food catches fire. The other is on the magnetron tube (the microwave source) to shut the oven down if the tube overheats. You can test these parts with an ohmmeter. They should be short circuits if good, open or very high resistance if bad.
While the fuse usually blows for a reason, it can sometimes just fail as can the thermostats. So if the fuse is blown, change it. Just be sure to use the same type and rating. The special microwave fuse is available at Home Depot, Lowe's and appliance parts stores. If the fuse blows again right away, there's something more serious wrong with the oven. Then you should probably just replace it unless it's a very high-end model or a built-in.
If a thermostat checks bad, they are available from appliance parts places. Take the old one along so you get the right replacement.
If you have any doubts about working on a microwave, take it to a professional for service if you want to keep it. There are potentially lethally voltages exposed with the cover off and power applied. But if you've worked on electical appliance before and are careful, there's not much to doing it yourself.
Posted on Apr 24, 2009
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Posted on Jan 02, 2017
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