Question about Microwave Ovens
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Posted on Jan 02, 2017
SOURCE: Microwave won't turn on anymore.
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
Almost all models have the fuse located under the control panel .Should come off with a couple of screws but careful with the ribbon. Hope this helps
Posted on Jul 30, 2009
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