During heating a cup of water in the microwave it became hot enough to blow the door open along with hot water out the microwave. A day later no power to heat.Turn table and light does not come on either. Can you help. Its a kenmore micro/ electric oven combo unit. Less than 2years old. Please help if you can. thanks jerome
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The only thing inside a microwave oven that draws enough current to blow a fuse is the magnetron that generates the microwaves to provide the cooking power. Based on the age of the unit (approx 15 years) it is most likely best to just replace it as repairs at that level are not cost effective. Newer units cook better and faster using less power these days.
I usually will test a cup of water for 60 seconds and it should be hot enough that you would not want to leave you finger in the water more than a couple of seconds. It would not be hot enough for most people to use for coffee or some other hot beverage but it would be hot enough to burn your finger if you leave it in there for very long. If it is still lukewarm after running for 60 seconds you probably have a problem with some of the major components and depending on the age of your microwave it might be cheaper to replace the microwave with a new one. Hope this helps you!
If the oven light and carousel lights up when you try to heat water in the oven, then your best bet is the fuse for the microwave oven is open. Unplug the oven, open the case after 30 minutes. Be careful of the capacitors. You will see something like a small plastic casing along one of the wires, usually color white. This can be opened. Usually a spare fuse is alongside, remove the fuse and replace it with exactly the same kind and rating. This fuse is not ordinary. It is about 1/8 inch diameter by 2inches approximately. Be careful that you get exactly the same rating of fuse. When you are done, place the plastic fuse case cover secure in place. Then put back the cover. Be careful that you replace the cover very well back. Be sure that you did not detach the door when you are removing the cover. If you have detached the door, you have a serious problem. Your oven might leak and you will have radiation burns. Place a cup of water inside the oven to test it and run the oven for 30 seconds.
Foods that are low in
density or low in moisture (such as bacon and popcorn, respectively)
can cause the magnetron to overheat.
That's because there is
not enough of either mass or moisture to absorb enough of the microwave
energy put out by the oven.
excess energy then reflects back to the magnetron and causes a standing
wave (like a poorly tuned transmitter antenna) and causes the magnetron
to overload and overheat.
When the mag gets too
hot, it trips
the magnetron thermostat, a protective device which rests when it cools.
If this overheating is a
persistent problem, a
stopgap is to put about 1/3 to 1/2 a cup of water in a microwave-safe
container (a Pyrex measuring cup is ideal) in a REAR CORNER
the microwave whenever you cook such items. This will help absorb
excess energy, but you may have to increase cooking time just a little.
of course I always suggest that food items be placed off-center in the
microwave, NOT in the center of the turntable, otherwise the food is
not exposed evenly enough to the microwave energy and will not heat as
efficiently as it could.
(Placing it in the
center is sort of
like stirring paint by twirling a stick in the center instead of
pulling it around in a circle in the paint can).
Such inefficient heating
wastes the energy at best, and at worst it puts a strain on the
a magnetron is repeatedly subjected to such stress, it will prematurely
fail. It will also draw excessive current, which can strain the
That in turn will often
lead to the
oven's drawing excessive current, resulting in a hot cord and plug, and
the fuse will blow - hopefully before the transformer or
An overheating magnetron
can be due to:
oven without cover(s) in place
magnetron installed in oven
an old or
otherwise failing magnetron
power line voltage (should be 110-125VAC)
foods low in
moisture (popcorn & bacon, e.g. - add 1/2 cup of water in rear
inoperable cooling fan or hood vent exhaust fan
foam weatherstripping seals in air ducts or on outside cover
vents (dust, animal nest debris, insufficient free air space behind
& around oven, etc.)
greasy charcoal filter or grease filter
Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.
The cost of the magnetron is about 95% of the cost of a microwave oven.
Most people don't, for this reason, replace the magnetron, they replace
the whole oven which is probably what you will end up doing.
There is a possibility that the circuit that provides power to the
magnetron is faulty and you need to take it apart, find the proper
electrical leads and test them with a volt meter. To do this you have
to remove it from its mounting and take it apart. It is a fairly
lengthy process however.
if electronic control, one of two things come to mind. 1)your toutch pad is defective.replace it. 2)you electronic board has a leaky component.not very likly though. believe it or not, ive seen it start before by itself then i noticed a large quantity of bugs inside the glass which i realised triggered the microwave 0ff.
The rectifier diode could indeed be bad.
But first I would want to know what value (in uF) the old one was and what is the value of the new one?
If they're too far off, the difference in the capacitive reactance could throw off the "tuning" of the circuit.
The uF value of the capacitor is optimized in relation to the other components used in the system.
Of course, you'd also want to be sure your new cap is at or slightly above the working voltage rating of the old one, too.