Question about Microwave Ovens

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Hi there in my microwave when i switch it on the rotator, fan and lamp gets switched on automatically. but magnetron doesnot get started untill i start the timer on the microwave. how can I stop rotatorm fan and lamp getting switched on and make it run along with the magentron. when I open the door its fine so to keep all the 3 things off while powered on I have to keep the door open and as soon as i close the door all three start working with no heating heating is only on with the timer clock of microwave. It might be something to do with the door latches (or the wiring being in reverse) . Please confirm and let me know

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  • Microwave Ovens Master
  • 9,047 Answers

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Mar 07, 2008

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Spontaneously stops working and then comes on after 5 minutes. Why?


Sounds like the magnetron is overheating. There is an automatically-resetable thermal circuit breaker attached to the magnetron. Most likely your problem is caused by either a cooling fan that is not running, or is running too slow (caused by gummed-up bearings). In some over-the-range (OTR) microwave ovens, the exhaust fan is run at a slow speed to cool the magnetron, and if it's bearings get gummed up, it won't run on the slow speed. But if it's a new OTR microwave, then the exhaust fan may be pointing the wrong way. (It is rotatable, depending on the installation). For example, if it is pointing up, but you don't have an exhaust vent over the microwave, then the air has nowhere to go, and the magnetron will overheat.

Oct 16, 2014 | Microwave Ovens

1 Answer

What is the cu ft, wattage, size, conventional oven yes or no, all the specs ect of the Kenmore mircorwave model #721.80833500


From the factory manual here:

SPECIFICATIONS
Rated Power Consumption ..............1700W maximum (Microwave oven+Cook top lamps+Ventilation fan)
Microwave Output ...........1100W (IEC60705)
Frequency ....2,450 MHz ±50 MHz
Power Supply .................120 VAC, 60 Hz
Rated Current ................14.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan)
Magnetron Cooling .........Forced Air Cooling
Rectification .Rectification Voltage Double Half-Wave
Door Sealing ..................Choke System
Safety Devices ...............Magnetron Thermostat: Open at 145 °C ±5 °C
Close at 60 °C ±5 °C .....................Oven Thermostat: Open at 110 °C ±5 °C
Close at 0 °C ±5 °C ......................Fuse(20A)
Magnetron ......................2M282J (Toshiba)
Cook top Lamp ...............130 V, 35 W (Halogen)
Cavity Lamp ...................130 V, 35 W (Halogen)
Timer ..............................Digital,up to 99 min.(in each cooking stage)
Tray ..............Tempered Safety Glass
Overall Dimensions ........2915/16"(W)x167/16"(H)x153/8"(D)
Oven Cavity Size ...........231/2"(W)x10"(H)x141/2"(D)
Effective Capacity of Oven Cavity ....2.0 Cu.ft.
Accessories ..Owner 's Manual &Cooking Guide, Installation Manual,
Exhaust Adapter, Exhaust Damper, Mounting Kit and Filter,
Rotating Ring Assembly, Glass Tray, Metal Rack, Guide Tray.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jul 09, 2011 | Kenmore 80809 Microwave Oven

2 Answers

GE JE1860WH04 oven - between one and two years old. Timer runs, but tray does not rotate and food does not heat. Tried unplugging and plugging back in - no help in the manual.


Firstly, do NOT attempt self repair of any microwave oven unless you understand the risks involved. Removing the cover exposes one to the magnetron and it's associated high voltage components. Lethal voltages exist when in operation.

Now, to your problem:
All microwave ovens operate on very similar principles, where the front panel controls switch power to the high voltage transformer (and then to the magnetron) and also any other related components, such as the turntable motor, and the internal lamp.
Most ovens have at least two protective devices that operate in cases of specific component failure.
These include: (1) Protective fuses that rupture when a short circuit condition exists, and, (2) a thermal cutout (mounted on the magnetron) that removes power in the event of overheating (usually magnetron cooling related). Unfortunately you did not state whether the control section is push button or the simpler rotary control version.

In the case of a push button (or digital) control system, it is quite possible that the circuit board has failed, and is not switching power to the rest of the microwave oven, despite the timer appearing to operate, or a protective fuse has ruptured.
In the case of a mechanical timer, either the timer has developed an internal fault (and is not switching power though) or a protective fuse has ruptured.

Thermal cutout devices, usually only operate when the magnetron exceeds a predetermined temperature (usually in the vicinity of 100 deg Celcius), and most of these thermal faults occur due to the cooling fan failing to provice adequate airflow though the heat distribution fins of the magnetron.

A volt meter would assist greatly in fault-finding, but beware of the high-voltage section, where voltages in excess of 3000 voltas are present.

Unless one is proficient with these devices (and fully comprehend the associated risks), I seriously recommend referral to a trained service provider.

Jun 08, 2011 | Microwave Ovens

1 Answer

When the Whirlpool microwave oven is on the loud fan noise is unbearable. It is not effected according to the power level, in fact when it stops cooking the noise remains until it automatically is switched...


The fan motor is going and it involves bad bearings or the lubrication in the motor has dried out. The fan is responsible for cooling the magnetron while it is running and is critical, I suggest replacing it as quickly as possible.

Mar 07, 2011 | Whirlpool MH7140XF Microwave Oven

2 Answers

Our Viking VMOS200 just stopped working. The lights and the countdown timer work, but no fan noise and no turntable spin.


it has nothing to do with the magnetron. first you have to fix step one. then you will know if the magnetron is bad. its one or two of the primary switches on the bottom of the switch tower. usually with these mw if you dont press cancel to stop the mw, and you just push the latch to stop it, those wires heat up and cause the microswitches to burn and loose proper contacts.

put a cup of water in the mw. set it to one minute and as its counting down. push on the latch LIGHTLY, as to not fully open the door and you will hear the magnetron kick on and the turn table start to rotate

Mar 06, 2011 | Viking VMOS200 Microwave Oven

2 Answers

Oven will not heat but turnstyle and other features operate ok.Is there a fuse that can be replaced?


several of the GEs i have worked on with your symtoms turned out to be bad magnetrons ... if the magnetron gets too hot then it will go bad .. you can get it really hot by running it without anything in the oven .. but several of the failures were caused by a fan mount failure ... there is a fan that cools the magnetron .. it is mounted on a plastic framework .. if the plastic breaks or distorts then the fan is not aimed in the correct direction .. the air goes around the magnetron instead of thru it and it fails to cool the magnetron ... so in these cases the fan framework was repaired and a new magnetron installed .. often that repair costs more than a new microwave oven .. there are other things that will cause the same trouble .. a high voltage diode, a capacitor, a transformer, a relay and a high temperature cut out switch ... the cutout automatically resets once things cool down but it can go bad .. the cost of some of these things is not high but labor often dictates the repair vs replace decision ... magnetrons cost a lot unless you have connections .. .at any rate you dont want to be powerering the microwave when its taken apart .. with the cover off there is potentially fatal voltage and current avalible by just touching the wrong thing .. ..

Jul 02, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Russell hobbs combination microwave oven (HOB CJ/AL28).The plate inside my microwave no longer rotates and also the light has stopped working to, it is only a year old!Also when it gets to hot its turns...


This is usually caused by either a bad door switch or a loose door switch mount, which are pretty simple problems to fix.

It sounds like the switch is not activating properly, and the inside light, turntable and magnetron cooling fan are not coming on.


If the magnetron runs without the cooling fan, it will overheat and its thermostat will interrupt the power to the oven until it cools back down.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Nov 30, 2008 | Microwave Ovens

1 Answer

MH6150XMT Turntable and Magnetron do not engage


Looking at the schematic from the mini-manual for this model, the problem should be the secondary (top) door interlock switch or its mount.

(Power-wise, the hood / cooling fan is further "upstream" from the turntable and high voltage section).

There should be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. Other times, it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and / or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

Jul 24, 2008 | Whirlpool MH6150XMS Microwave Oven

1 Answer

My GE Profile microwave will not heat all of a sudden. It is not quite 2 years old. It starts up but won't heat. Do you know what the problem could be? Could it be the magnetron? ...


If the fans are running, the cavity lamp is lit, and the platter is rotating as if the oven is working, this indicates that the safety switches should be okay.

This indicates that the fault may be with the main controler board, or with the power supply for the magnetron. On rare occasions, the magnetron may be defective.

You can bring the oven in for a service estimate. If it is out of warranty, you may find it a little bit expensive to service in relation to changing it.


Jerry G.

Apr 19, 2008 | Microwave Ovens

1 Answer

GE Spacemaker Microwave with vent fan


hi possible magnetron problem but also check highvoltage capacitor and diode . the process of ellumination is the only way to help u .first disconnect connegtor to magnetron and switch oven on if noise goes away eureka repeat with other components

Mar 18, 2007 | GE Spacemaker JVM1640SJ Microwave Oven

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