Question about Microwave Ovens

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I cook item for 10 min. at atime x2 then quit heating it will turn on like it is working but doesn'theat

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It is because of the defective magnetron. Replace the magnetron by a new one

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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My oven is working but the item inside is not heating. If I put 2 minutes, the oven wprks for 2 minutes, but the item inside is as it is without slight heating


It's very likely the high voltage fuse has blown, often because there's a fault in the cook section, or the fuse has metal fatigue. It will be in a thick plastic tube near the transformer and cook capacitor. Turn the oven off and unplug it for 10 mins, then take the cover off. As a precaution, short out the cook capacitor with a screwdriver. The capacitor is near the transformer, usually an oval shaped can. If it's not fuse fatigue, it can be: faulty capacitor (unlikely); faulty protection diode across capacitor, if there is one (very likely, must be replaced same way round as original); faulty rectifier diode from capacitor to chassis (less likely) or a magnetron heater that is leaky to chassis. All these things need to be disconnected, and tested one by one with a 500V insulation tester, because an ohmmeter will often not show faults in high voltage parts. Any leakage at 2200V will blow a fuse. If there's no high voltage fuse, it will blow the mains fuse inside, then nothing will work, but it's not that with yours, since it partly works. The oven can run without the high voltage fuse, just replace it with a wire with nice thick insulation, or with some plastic tubing over it. Anything else that's faulty must be replaced. I get my parts from WES Components at Ashfield in Sydney. Microwave parts in the cook section have high voltage ratings, and must be replaced with at least equal rating components. I just fixed a Samsung microwave with its high voltage cook fuse blown. The rest was ok, so I'd say the fuse wire inside had metal fatigue. I also always put a drop of light oil on both ends of the fan shaft, it runs quieter and faster then.

If the fault happened suddenly, it will be one of the above faults. If the oven is very old, it will have a gradually increasing cook time, as the magnetron wears out. If the cooking time is too long, replace the magnetron, they're only held in with 4 screws or nuts. It must be the same physical fit and at least the same power rating as the oven's rated output power.

Feb 25, 2016 | Sanyo Microwave Ovens

Tip

DANGER WARNING! Potential Hazard if your microwave was working and now doesn't...


If you have this model microwave and it was working fine, then one day it stopped heating items placed inside there are a handful of different issues that could be the problem. In my case it was intermittent, over a period of a few days it would sometimes work (heat) and sometimes not. NO MATTER if this is what your's is doing or if it stopped heating all together. If you decide to let it dry out, or not use it for a while to see if it was a one time occurrence, or whatever the reason, the first time you put something in and probably for the next 10 times at least (this assumes it starts to work again), make sure you are right there with it while it is cooking. Don't assume you can put something in, go do something and come back when the timer is beeping. There is a chance (as this happened to me) that your food inside will CATCH FIRE! Normal food item placed inside, no metal, nothing different than the numerous times before when this had been cooked but when we smelled smoke we came running. Fortunately it started and finished inside the microwave but that's not a guarantee, it could spread. Play it safe. Never had a problem like this before and never heard of a microwave cooking something until it caught on fire (especially since the time entered for the cook was 30 seconds) but it did.

on Sep 23, 2013 | GE JVM1850SMSS Microwave Oven

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

Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.


see the next causes. 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 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Stops working after 20 seconds


The magnetron is over heating causing the thermal fuse to open to cut power, the only option is replace the part, but keep in mind it is the most expensive item to install.

May 07, 2012 | Bosch HMT9626GB Microwave Oven

1 Answer

Maytag Microwave apprears to work but does not cook


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

Basic Microwave Oven TroubleshootingTips

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May 17, 2010 | Maytag MMV4205 Microwave Oven

1 Answer

Does not cook even . put 2 items in cooker one well done other one half,


were both items the same density? Was one maybe thawed more that the other? A microwave cooks by rapidly heating the water molecules within the product that you are heating. If you heat two of the same product, it should cook them both evenly, however say you put in a frozen hamburger and a thawed hamburger, the frozen one will only begin to defrost while the thawed one will actually cook

Feb 11, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Toaster Master 1979 has less power


Because the microwave energy is beamed into the interior of the microwave and then dispersed by a metallic "stirrer," the pattern of the energy can be fairly consistent, rather than completely random. But this pattern sometimes causes certain portions of the food to overcook (creating tough spots) and others to undercook. A microwave oven with a carousel is far better at cooking the food consistently--the pattern becomes quite random while the carousel is turning.

Nov 13, 2008 | Microwave Ovens

1 Answer

Express cook doesn't heat. Time cook seems to work at least sometimes


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

Oct 04, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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