Question about Maytag MMV4205 Microwave Oven
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Posted on Jan 02, 2017
it is triggering the overtemp switch. try to check the vent outlet, it could be clogged with dirt. or the cooling fan of the magnetron is no longer running. could be stuck up because of not being used for a long time.
Posted on Feb 21, 2008
SOURCE: my maytag microwave lost power
There is always a fuse inside a microwave.Sometime this has only blown due to a surge,and upon replacing, the microwave will continue working.If it is something worse the fuse will continue to blow.In this case it could very well be the transformer,but there are other possible causes as well.(for example the control board or a short.)
Posted on Jun 24, 2009
A microwave can be dead for many reasons.
It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.
Ifthe fuse is good, it may be an open thermostat or thermal cutout (TCO)/ thermal fuse on or near the magnetron or on top of the cavity / bodyof the oven.
If it goes dead for a while during or after cookingthen comes back on, the magnetron is probably overheating and causingthe magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
Whenchecking thermostats, if it has a hood fan thermostat, that should readopen, as opposed to the others, which should read closed.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
Ifit goes dead or blows the breaker (or GFI) when you plug it in or open or closethe door, then there's a problem with a door switch or door switchmount.
If it's intermittent or random, it may be a badconnection, usually on the control board or a loose fuse holder, oreven an intermittent fuse.
You should do a continuity test onthe fuse while it's in the holder (with the microwave unplugged, ofcourse) then turn the fuse by hand or take it out and put it back in,then test it again.
If you remove the fuse, then press the meterleads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
Posted on Sep 21, 2010
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