Question about Microwave Ovens

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My microwave continues to run 2-3 seconds after cook time. It doesn't seem normal but it works fine otherwise

Once the cook time is set and the start button is pressed, the microwave continues to run fine until the end of cook time. It beeps 2 or 3 times and after the beeping, it will shut off. I don't think I have seen this on another microwave, so I don't think it is normal, but it works great otherwise. It is a used microwave, so there is no warranty.

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Microwaves are cheap, if you are worried replace it, With what i k now about electronic clocks I am willing to bet it's not a safety issue.

If you want to be sure you could measure the amount of current it is drawing from the outlet and compare this with the specifications on the back of the microwave. Either get a "kill-a-watt" device, a multimeter with a current probe, or if it draws less than ten amps according to the sticker on the back you could use a regular multimeter to measure the current by hooking it up in series. The "kill-a-watt" is a brand name for a device that plugs into the outlet and then you would plug the microwave into. It will measure the amount of electricity it uses and display it on a screen. This device or the current probe would be the safest as you don't touch the wires. Hooking up the multimeter in series requires splicing wires.

Posted on Apr 04, 2015

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The easy answer is to shorten the time you set. But be careful not to open the door when food is still cooking, or else you will expose yourself to unnecessary amounts of radiation.

Posted on Apr 05, 2015

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1 Answer

Sometimes oven does not work. when ya hit start it just clicks - the screen looks normal for about 2seconds & then shows the clock time.


Sounds like is what's happening:

Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back.

That would be a bad upper interlock switch and charred connector. If so, see:

http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt
http://031d26d.namesecurehost.com/mwd/doorsw.txt


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

Dec 11, 2012 | Panasonic NNSN797S Microwave Oven

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.
10_4_2012_4_35_53_pm.gif10_4_2012_4_36_18_pm.jpg

Oct 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Khhc2090s trouble


The sensor errors are probably just from opening the door and interrupting the sensor cook cycle.

By the way, you should always press "Stop" before opening the door of a running microwave. Otherwise, the door switches will prematurely fail.

I would first check the door switches and their mounts. See this help file.

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

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

12_3_2011_7_32_02_pm.jpg

You can also download manuals, installations info, and parts lists here.

dee77f7.jpgWe're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Nov 25, 2011 | KitchenAid Microwave Ovens

2 Answers

I have Emerson Microwave #mw8999sv which has the Express Cook option- cooking 1 - 6 minutes. How do I cook for 1 minute 30 seconds, etc.? Thank you.


The owner's manual is here. On page 10 we find:

COOKING IN ONE STAGE
1. Press the POWER button; the Microwave and High
Cook indicators will light and “PL 10” will light in the
display.
2. Press the POWER button different times to set the
desired power; the display will show the percentage
you chose. If selecting power level 70%-10%, the
Low Cook indicator will light instead of the High
Cook indicator.
3. Press number keys to set the desired cooking time.
OPERATION(CONTINUED)
4. Press the START/+30SEC. button to start cooking;
the Microwave and one of the Cook indicators will
blink and the display will countdown the remaining
cooking time in minutes and seconds. It will beep
five times when cooking is completed.

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


Sep 08, 2009 | Emerson Microwave Ovens

1 Answer

Microwave still continues after cooking time is ended


It is the fan. Im guessing it only happens on combination cook and not when you are only using the microwave setting. It happens because the oven is hot and it helps to cool it quicker. It is normal. The microwaves are not working and neither is the oven-just the fan.

Mar 31, 2009 | Oster 0.7 Cu. Ft. Compact Microwave

2 Answers

Panasonic NN-S262SF stops cooking after 3 seconds


inverter problem the transistor 1M30D is shorted

May 28, 2008 | Panasonic NN-S262SF Microwave Oven

2 Answers

Microwave cycles off


Does this happen just at the full power microwave cook setting?

Have you tried defrosting and doe sit do it on this setting? Does it run any longer in defrost mode?

Dec 02, 2007 | Microwave Ovens

2 Answers

KitchenAid KCMC155J


Sounds like a classic bad door switch or switch holder. If you or a friend decide to work on it, we have *critical* safety info, info on door switch testing and replacement, and oven disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383

Mar 11, 2007 | KitchenAid KCMC155J Convection/Microwave...

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