Question about Samsung SMH9151 Microwave Oven

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Everything works but doesn't heat - Samsung SMH9151 Microwave Oven

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If everything looks like its cooking and it does not heat then it is your mag tube that is dead, it will need to be replaced. You can order one from marcone.com with your model #

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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Mmv4205ba


You probably fried the magnetron.Unless you have a really high dollar microwave,you're probably better off replacing it.

Aug 24, 2014 | Maytag Microwave Ovens

1 Answer

Frigidaire microwave plate won't turn


The motor for the rotator is bad. It has to be replaced.

May 06, 2013 | Frigidaire Microwave Ovens

1 Answer

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


IT'S THE MAGNITRON - CHEAPER TO BUY NEW THAN REPLACE - SORRY.

Jan 09, 2013 | Microwave Ovens

1 Answer

Maytag microwave problem everything seemingly works but does not heat. Help


see this causes and fix it. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron 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.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse 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.
Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board 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 within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.


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Oct 01, 2012 | Maytag MMV4205 Microwave Oven

1 Answer

Electrical short /pop sound & now it doesn't heat. Everything else works. Any idea what went out.


The signs are not always evident, but from the description the magnetron has failed.

Apr 13, 2012 | Sharp R-1491 Microwave Oven

1 Answer

My Sharp R-1502 over the range microwave doesn't give any heat at all. What parts do you think I will buy to solve the problem?


There is to many parts that can cause no heat, and some are very expensive, plus the voltages in the microwave oven are lethal. I strongly recommend a professional because of safety, and he has the tools and test equipment to get to the bottom of the problem.

Mar 26, 2012 | Sharp R-1502 Microwave Oven

1 Answer

Microwave is less than a year old. It looks like everything is working, timer, light, air, turntable, etc., but it doesn't cook.


HI..there is a heating filament of an oven MAGNETRON..it s responsible of producing heat to the oven..possibly this is defective ..this filament must be replaced by a new one..theres no problem with the motor cos it runs the table power and light button seems working..HOPE THIS HELPS

Jul 06, 2011 | Oster Microwave Ovens

1 Answer

Doesn't heat up but everything works


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 ';'
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May 18, 2011 | Emerson Black Microwave Oven

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