Question about Microwave Ovens

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Power, light and turntable are working but the microwave isn't cooking or defrosting on any setting.

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  • Microwave Ovens Master
  • 6,771 Answers

The most likely problem is the magnetron, the other two parts are the high voltage capacitor and diodes that can be a factor. Chances are the cost to repair will exceed a new microwave oven.

Posted on Mar 15, 2011

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Apr 22, 2015 | Sharp R530EWT Countertop Microwave Oven...

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My microwave stopped working you can input time but when you push start nothing happens it has power and everything just will not start its like the start button does not work


Possibly a bad door switch behind the holes where the latch hooks go into. Usually with the bad switch the timer counts down but nothing runs. It all depends on which switch is bad. Usually 3 switches inside.

Apr 13, 2015 | Sharp R530EWT Countertop Microwave Oven...

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My microwave is 25 years old, will it be working to maximum efficiency


If all the settings work and the door closes ok . why throw it out ?. It may not be quite as efficient power wise as a brand new one. the few cents extra to run it against the price of a new one, I would stay with old faithful.

Dec 31, 2014 | Sharp R530EWT Countertop Microwave Oven...

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Would like specifications to JVM1850SM2SS


  • 1.8 CF Oven Cavity
  • Electronic Touch Controls
  • 950 Watts
  • Display On/Off Yes (option pad)
  • Add 30 Seconds Instant-On
  • Cooking System CircuWave®
  • Defrost - Auto / Time / 1 lb. Quick Defrost
  • Delay Start
  • Express Cook Instant-on 1-6 minutes
  • Instant On Controls
  • Micro / Time Cook I & II
  • 10 Power Levels
  • Wire Oven Rack
  • Cooktop Lighting - Bright/Night/Off
  • Demo Mode
  • Interior Oven Light - Halogen
  • Night Light (option pad)
  • Child Lockout
  • Easy Mount Installation
  • Exhaust Fan 3 Speed Plus Boost (315 CFM)
  • Cooking Complete Reminder
  • Timer (On/Off)
  • Reminder (24 hr)
  • Sound Volume Control - 4 levels
  • Sensor Controls
  • Beverage Instant-On
  • Popcorn Instant-on
  • Potatoes Instant-on
  • Reheat Instant-On
  • Sensor Controls
  • Vegetables Instant-on, 3 pads (canned, frzn, fresh)
  • SmartControl System
  • Clock Plus AM/PM pad
  • Concurrent Programming
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  • Electronic Scrolling Digital Display - 2 line
  • Help Pad
  • Variable Scroll Speed - 5 Speeds (Options Pad)
  • 14.25 " Turntable - Glass Recessed
  • Turntable On / Off
  • 2 Wire Oven Racks; 2 Positions
  • Recirculating Charcoal Filter Kit JX81B

Dec 15, 2014 | GE Microwave Ovens

1 Answer

Sharp Carousel R530BK microwave won't cook unless light pressure is kept on the door button.


There are door switches and one of them is evidently out of adjustment or the little actuator arm on it is.

Nov 27, 2013 | Sharp R530EWT Countertop Microwave Oven...

1 Answer

Hamilton Beach microwave will not heat or cook anything HELP ME PLEASE


bad diode or inverter board or magnetron itself---diode fails first and inverter is power board for magnetron which does the heating.

Nov 06, 2012 | Microwave Ovens

1 Answer

Emerson microwave not working 900 watts


The Emerson MW8999SB 0.9 cu. ft. 900 watt Microwave Oven is relatively compact, and certainly inexpensive, but doesn't skimp on functionality. We were surprised at all the options you get with this little microwave. It's only 20 inches wide, 11.3 inches high and 16.1 inches deep yet. The interior can still accommodate a regular size dinner plate or small (10-inch-square or round) casserole. Plus, there are 10 power levels, eight one-touch function buttons, six Express Cook settings, timed and automatic defrost options, and a rotating glass turntable to circulate the food for more even cooking.

We were very pleased with the performance of the Emerson MW8999SB. It did a fine job heating water for tea, cooking a couple of baked potatoes, reheating leftovers and steaming fresh vegetables. Even the automatic defrost proved surprisingly efficient, letting you enter the weight of the item(s) to be defrosted (4-100 ounces) for easy operation. Chicken breasts were almost fully defrosted after one cycle. We needed to stop and separate the food pieces to finish the defrost cycle.

The unit is styled mainly in black but has stainless steel trim around the door and control panel. The smooth touchpad control panel is attractive and easy to wipe clean. We loved the one-touch Express Cook buttons, which let you activate the unit at 100 percent power for 1-6 minutes, by pressing the corresponding number pad. We also appreciated extra touches such as the Start/+30 sec. button, which can be used to start the oven or add an extra 30 seconds each time it is depressed.

It's hard to go wrong when the functions are so simple. The only tricky part was identifying certain codes used on the display screen. When changing the power level, for instance, PL10 is displayed on the screen. Pressing the button additional times lets you toggle through the different levels. Likewise, the Auto Cook settings may need to be pressed multiple times to obtain the correct weight or portion for the food being cooked.

We were amazed that a machine costing so little also offered two-stage cooking, which lets you start cooking (or defrosting) on one setting and finish on another. All in all, the Emerson MW8999SB is an excellent value.


Pros: Touchpad controls, eight one-touch function buttons, six Express Cook settings, two-stage coking option
Cons: Limited interior capacity can only accommodate dishes up to 10 inches, no sensor

Jul 29, 2012 | Hotpoint RVM1435 Microwave Oven

1 Answer

The microwave isn't heating/cooking on any setting but the turntable, light is working. What should I check before calling a repairman?


There is nothing more you can do, you have verified everything is working except it is not heating the food. The next step is have the repairman come in to isolate the cause.

Jun 02, 2011 | Maytag MMV4205 Microwave Oven

2 Answers

Microwave lights, clock, and everything works except when you press start, it just counts down like its cooking, but the microwave is actually not on. No hum as usual or plate rotating. It just counts...


Hi, one of the most common reasons why the turntable won't rotate is that the microwave isn't clean. The turntable guide and carousel can get sticky, preventing the turntable from properly moving. If you have built-on food particles or liquids, fill a bowl with 2 or 3 cups of water and 1 tsp. of liquid detergent and lemon. Run the microwave for about 3 minutes. Clean the microwave with a cloth, including the base of the turntable, guide, carousel grooves and microwave base. Your microwave turntable won't rotate if the grooves on the base of the turntable do not sit right on the carousel. Also, check the position of the turntable guide. Place the guide directly under the turntable. Remove the turntable, and then reposition it into the carousel grooves.
Motor The carousel motor is located beneath the base plate of the microwave. If the carousel isn't turning at all, check the motor. Disconnect the microwave from the power source, and remove the turntable, guide and base plate. Try turning the motor to see if it's just stuck. If it doesn't turn freely after a few seconds, examine the motor to see if it's burned out or corroded. Use an ohmmeter to see if the motor has continuity. If not, you must replace the motor.
Bushings The drive bushings are plastic components that sit underneath the cooking plate. Remove the plate, and examine the bushings. Use a magnifying glass if necessary to see if any debris is caught in the plastic. Clean the bushings, and reinsert the plate. Turn the microwave on to see if it rotates. If the bushings are extremely worn or if some of the plastic is broken off, you need to replace it, which is a complicated repair for consumers. Contact a service technician for assistance.

May 07, 2011 | Amana Radarange Microwave Oven

1 Answer

Microwave wont heat up


Your signs point to a failed power tube. First though, does it defrost? If it does it is an electrical control problem. If it does not defrost, do the following.... With the power unpluged you may want to remove the outer cover, ( screws at back ), and locate a shiney metal box. That box is shielding for the power tube. Get the part # from the tube and replace. You could check price and availability at www.avnet.com . Make sure you replace all of the shielding exactly the way you found it. VERY VERY IMPORTANT!!!!!

Dec 02, 2009 | LG Microwave

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