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Re: Microwave does not heat
Sounds like the magnetron has failed. This is the component that
produces the microwave that heats the food. The cost of the magnetron
is about 95% of the cost of a microwave .
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.
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If it looks and sounds like it's running but doesn't heat, one possibility is that the magnetron tube has burned out. This is the electronic tube that emits the microwave radiation. Another possibility is that the control circuit that regulates turning the magnetron tube on and off for defrosting and lower-than-100-percent heating rates could be faulty. Try heating with the defrost setting and at full power and see if either method results in any heating. The cost of replacing the magnetron at a repair shop could be high enough that you might rather just buy a new microwave oven. My father replaced the magnetron tube himself, but he's an electronic engineer. I wouldn't recommend that just anyone try it. How new/old is it?
hello there and welcome to fixya there are a few things than may have happned i will post the most common ones first ok If the microwave oven doesn't heat the magnetron tube might have burned
out. The magnetron uses high voltage, high current DC power to generate
the microwave frequency that cooks the food. If the microwave oven is
turned on when it is empty this can cause the magnetron to burn out.
Once it is burned out it has to be replaced, it's not repairable.
Next ks the thermal fuze If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information. and finley If the microwave doesn't heat the main control board may be defective.
This is not common. When a microwave doesn't heat the problem is usually
a faulty door switch or within the high voltage circuit; either the
high voltage capacitor, diode, transformer or magnetron.
see this causes and proceed. God bless you
If the microwave is loud or noisy only when
cooking, the magnetron tube might be defective. The magnetron uses high
voltage, high current DC power to generate the microwave frequency that
cooks the food. Under normal circumstances the magnetron is nearly
silent. However if it is damaged or nearly burned out it can begin
emitting high pitched or growling noises. It's not normally dangerous to
use a microwave oven when it makes these noises, but they are an
indication that the magnetron is almost dead and will need to be
Exhaust Fan Motor
If the microwave is loud when running the fan motor might be
If the microwave is loud or noisy the stirrer
motor might be worn out. The stirrer is a metal blade which slowly
turns around, deflecting the microwave energy in a random pattern inside
the microwave oven. As the motor nears the end of its useful life it
begins to make grinding noises. The microwave will not heat food evenly
without this stirrer, the motor should be replaced.
If the microwave is loud or noisy the
turntable motor might be worn out. This is a common problem and
relatively easy to replace.
Microwaves are a quick, convenient
solution to the hassle of preparing and cooking hot dinners. They are
popular appliances with students and large families where food often
needs to be prepared fast. Microwaves use radio wave technology
harnessed through an antenna, known as a "magnetron," to create friction
between food or liquid molecules, causing them to heat up. Some
microwaves can cease to function properly, resulting in the appliance
running but failing to produce any heat.
Magnetron tubes are often the
source of heating problems in microwaves. Before having any repair work
done, check the warranty on your microwave. Many companies offer 10-year
warranties on magnetron tubes so you may be able to get it repaired
professionally for free. Otherwise, unplug the microwave then remove the
rear casing with a screwdriver. Locate the tube inside the microwave
and check it for burn marks. A burnt tube cannot usually be repaired
and will require replacement. A tube that doesn't appear burnt should be
tested by a qualified technician to see if it can be repaired.
High Voltage Capacitor
A microwave capacitor holds
electricity as the appliance is running. A malfunctioning capacitor can
lead to the microwave not heating, along with an irritating buzzing
sound. Test the capacitor by first disconnecting the power then removing
the wires attached to the capacitor. A capacitor with burn marks is
usually damaged beyond repair and will require replacement. A capacitor
can be tested by connecting each of the probes of an ohmmeter to the
capacitor terminal. Each probe should provide a reading of infinity if
the capacitor is working properly.
The diode in a microwave oven is
a one-way pathway that channels electricity from the capacitor. A
malfunctioning diode can sometimes be the cause of a microwave that
won't heat. The heating problem is often accompanied by a loud buzzing
noise. You can test the diode by first unplugging the microwave oven,
disconnecting the diode from the capacitor then measuring the level of
electricity inside the diode with an ohmmeter. The ohmmeter can
determine whether the electricity in the diode is flowing in one
direction as it should. In most cases, the magnetron tube will have to
replaced as well if the diode is damaged.
Disconnecting the plug from your
microwave to carry out an inspection does not guarantee safety. Even an
unplugged microwave still has electricity running through its
components, which can lead to severe electric shocks. Unless you have
previous experience in dealing with electrical appliances, it is
advisable to hire a technician to test component parts rather than
undertake the job yourself. Anyone without a basic knowledge of
electrical currents and safety should avoid testing components
A burning smell is usually a sign of a bad magnetron tube, the microwave source. As they age they take more power, and this causes excess heating that can cause the smell. Eventually the tube burns out and you get no heating. If you've been noticing longer than normal cooking times, it's due to the weak tube.
You can replace a magnetron, but it's a costly part (around $100-$125) and the repair should be done by a professional because of safety concerns. (Several websites describe how to replace a magnetron if you'd like to try it yourself, but you need to be very careful. MICROWAVES USE HAZARDOUS VOLTAGES WHICH CAN KILL YOU.) Between the part and labor costs, when the magnetron goes bad it's often more economical to spend a little more and replace the oven.
There are some other parts that can get hot and sometimes smell, but the magnetron is most common. If you want to keep the oven, I'd suggest letting a professional check it over and give you an estimated for the repair. Then you can decide what you want to do.
you have a problem with your magnetron tube, and when the magnetron tube goes bad, the diode almost always goes out with it. you should be able to order a replacement tube from your manufacturers website, if you cant let me know and ill try to help you more.
here are the steps to replace the magnetron tube, if you want to do it yourself that is. if you have a professional do it, it can be pretty costly.
Unplug Microwave at least few hours before
Remove Microwave from above oven range by somebody holding Microwave from ground unscrew the screws from cabinet
Remove top cover of Microwave
Make sure to keep screws correctly in a place you remember what goes where
Make sure capacitor is discharged, GE manual inside Microwave says capacitor will discharge within 30 seconds once it is off. As a precaution check the voltage in capacitor to make sure there is no electricity
Remove other panels around magnetron part
You need to remove lot of connecting wires, should be careful to note down what goes where
If possible take digital photos to refer back when you put everything back together
You may need to remove transformer to easily remove and replace Magnetron. If you can't remove Magnetron easily then remove bottom panel of the Microwave and remove transformer
Now it should be easy to remove magnetron
Replace new magnetron and screw it. We had to put one outside part from old magnetron to new one because new one was missing that. Check to make sure both old and new one are exactly the same
Make sure put all wires properly back
Now put transformer back and screw it
Put capacitor panel in place and screw it
This might be a good time to test the Microwave to make sure it works fine now
Now cover the top panels and start to screw everything
Once everything assembled put the Microwave back above range put screws from top
Check the following before you replace the Magnetron device.
1. Check the diode located inside the unit on the noise filter board assembly. it may be damaged. 2. Check the Magnetron Cut-Off Fuse. this will shut off the heating device if there is a fan issue. 3. Check the H.V. Capacitor for burn marks and, discolored terminal points. this will be a sign of a malfunctioning Capacitor device. replace if needed.
If all is ok with the above check list, replace the Magnetron tube.
if you are familiar with Micro oven servicing follow these steps
a microwave oven is a dangerous task. The high-voltage potential combined
with the high-current capability of an operating microwave oven pose
a deadly threat to a careless worker 1.Shorted Magnetron tube. 2.Replace Magnetron tube 3.Check Built-in surge protection
on printed circuit board has opened. This circuit consists of a fine foil
pattern (or filter coil - depending on the model) that acts to fuse the
primary side of the low-voltage transformer. 4. Rebuild the surge protection
circuit. Replace the varistor 5. Magnetron filament connectors have loosened and,
due to resistive heat, the terminal connections have deteriorated
and burned off. 6. Repair defective terminals as follows:Either
(1) Cut away burned wire, clean the magnetron terminals, and replace
the slip-on connectors, or (2) Cut away burned wire and connector(s).
Clean terminals to prepare for soldering. Solder filament leads directly
to magnetron terminals. Be careful not to apply soldering heat any
longer than necessary 7. Check for Weakened fuse clips in the
fuse receptacle causing fuse to melt due to resistive heat. Usually indicated
by a bead of solder leaching out from either endcap and/or evidence of overheating (or burned spot) at the endcap, fuse
clip, or terminal connection
8. Replace amp fuse and receptacle.Generic fuses and
fuse holders are available at appliance and electronic part suppliers. 9. Contact service center .. all the best ..thank you