Question about Jenn-Air JMC9158AA Convection Microwave Oven

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Microwave responds to all buttons except no microwave energy? Is there a fuse on the magnitron that could be the problem

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2 Answers

How do I fix a Microwave?

A microwave is not a good candidate for novice repair. However, since it isn't completely dead, the power circuit is likely intact (not a blown fuse). The major components involved are the capacitor and the magnitron. The cheapest is the capacitor. If you have to replace the magnitron, it is not likely economically feasable. Be careful of the cap - it contains energy even when unplugged!

Jan 02, 2015 | Kenmore 30" Microwave Combination...

2 Answers

Kenmore 1000w Not Heating Food Items

If it sounds like it is running and it lights up it is not the fuse. In my 24 years of service work I've found that the problem you are describing is cause by the failure of the magnitron ( The device that emits the microwave radiation). As your unit is a built in expensive unit I would look into replacing the magnitron. In cheap microwaves I just suggest replacement. If you need further assistance locating a replacement magnitron feel free to cotact me. It is a relatively easy part to replace. You just open the case and unplug it, unscrew it from the unit, and replace it with the new one. In most cases all you need is a philips head screwdriver and some patience. Anyway, I hope this helps you out in your decicion.

Jul 19, 2008 | Kenmore 62642 / 62644 / 62649 Microwave...

1 Answer

Will running the GE profile JE1860sb 001 with nothing in it destroy the magnetron

no the big fuse has gone usually 10 amp bigger china body fuse
so get the right bits
has no display so no power

i think your microwave oven
may have a fault in a thing called the diffuser plate
its a square or rectangle of mica a mineral
its used to scatter the waves around the oven for even cooking
it can develop carbon tracking as it changes state
so shorts out the energy to the body of the oven and can eventually blow the fuse as fuses become tired from surges of used energy

or some part of it has a problem exposing some metal parts not earthed to the chassis

magnatrons are the best actual valves every made
almost indestructable other than the heater element {inside the square end metal can is its connections usually welded {dont try to solder them}

so no the magnitron is aok
look for another reason

usually replacing the fuse and defuser and a good clean perhaps sometimes its the plate rotation drive motor plastic drive part
also becomes carbon tracking

causes the same error

good luck

note for all ::
next time buy a stainless steel microwave
from a good maker
and good parts supply of defuser plates as they do go wrong

Dec 21, 2014 | GE Microwave Ovens

2 Answers

How do I correct a microwave that runs automatically with a display when connected to power outlet but does not heat up anything. The kitchen timer,clock and all other buttons works except express coo

Check and replace magnitron with one of the same number or equivalent.High tension transformer fuse may be blown or high voltage diode and or capacitor shorted. N.B. Please disconnect applance from mains and discharge large capacitor before carrying any DIY on any microwave,

Nov 07, 2014 | Emerson Microwave Ovens

1 Answer

I don't know why my frigidaire gallery microwave FMT118EPB goes on but doesn't heat

the magnitron supply EHT isnt there

or the heaters connections inside the square metal box
have come loose
replace the magnitron is best and check the eht fuse {inline type usually}

Aug 13, 2014 | Microwave Ovens

1 Answer

Everything on microwave works except it doesn't heat or cook. what is the problem?


Jan 09, 2013 | Microwave Ovens

1 Answer

Everything works except the heating of food, etc.

When the magnitron fails it will do one of two things, it will give no microwave action to the centerplate or it increases in strenghth many times to where it is very hazardous. Yours appears to be the first case. I;'m assuming that you've checked the fuse on the board, seeing you were already back in there to check the harness to the magnitron.

Sep 07, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave has no power

inside the microwave there is a low voltage power supply that powers the computer and display ... that is not working in your case .. if there is no low voltage power then nothing else will work .. there are several possible causes .. you can have a blown fuse on the low voltage power supply board (usually the main and only board) ... there is also a thermal fuse ... if the microwave magnitron got exceptionally hot then it could trip the thermal fuse .. this would kill power to everything else ... high magnitron tempratures can be caused by blocked air flow or running the microwave with nothing in it ... once the thermal fuse is tripped it has to be replaced ...there is also an over temperature switch that simply shuts off the power until the system cools , but this is self reseting unless it goes bad .. inside the microwave oven electronics are the most dangerous combination of high voltage and high current you will likely encounter in your life .. you simply have to know what you are doing in there ... this combination can be fatal in a fraction of a second ... your problem is inside there where its dangerous .. the low voltage supply and computer are not dangerous but the voltage they control is .. .. all parts that can cause this trouble are available for most microwaves so yes its repairable but think twice before opening .the case .. there are microwave repair centers around here .. the cost may or may not be reasonable since new microwaves are available for really good prices right now ....

Aug 18, 2009 | Microwave Ovens

2 Answers

Everything works except it doesn't heat anything

no, just 1 main fuse for everything. there are temp safety devices though, and door closed safety switches. Most likely failure though is the magnatron.

Dec 30, 2007 | Kenmore 64002 Microwave Oven

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