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Is it normal for a microwave to keep switching from a low power to high power?

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Consult the owner manual but unless it has a feature this is not normal.

Posted on Nov 07, 2012

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Posted on Jan 02, 2017

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1 Answer

GE Profile microwave oven PEB7226SFSS quit warming food but appeared to be on/operate with light on/timer counting down. Installed door switches-now the microwave "works" only when the door is open


Sounds like on reassembly you reversed wires to door switch.
switch might have letters C NO NC (common, normally open, normally closed) one wire goes to C common, the other to NC normally closed. Try reversing the wires.
If you use meter measuring continuity meter on C and NO should be high resistance until you press switch.
meter C to NC measures low resistance until you press switch then measures high or infinity (open)

Sep 28, 2016 | GE Microwave Ovens

1 Answer

What is the output power of National NN-C2000P microwave oven?


the pwr rating is normally on the label.
google for a manual

Feb 02, 2016 | Microwave Ovens

1 Answer

Why does my microwave keep popping the circuit breaker?


could be anything in there, light turntable motor or the microwave circuitry, try low power settings check light and turntable if they work, if pops at high power circuit problem, probably cost more to repair than replace

Jul 29, 2014 | Microwave Ovens

1 Answer

Can't determine high or low on power control


put a cup of water in the cavity and set for 1 minute, after which time you can feel the temperature. Switch to the other power setting and repeat with a fresh cup of water. This will either be hotter than the first or much cooler. Most microwaves use 100% power for full and 30% power for defrost, with 50% usually being lower or medium power. Straight-forward physics. The more power the hotter the water becomes. Hope that helps.

Dec 19, 2013 | Sharp R-303CW Convection / Microwave Oven

1 Answer

I have panasonic nn-gs597m microwave its working normal but not heating, I opened the cover magnetron is hot the fan is working. Any help?


follow the next steps , use the VOM 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. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.


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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. When a high voltage transformer fails it will usually arch and have a burning smell.





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 a faulty door switch or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Jun 16, 2013 | Microwave Ovens

1 Answer

Was removing a burned out bulb in my LG LMVM1935SB LG Microwave cooktop/oven. The bulb broke, and we had to finish getting the bulb out of the receptacle. The other light worked, but now apparently is...


When removing a bad bulb ALWAYS unplug the unit. If there is power going to the bulb and when you try to take the bad bulb out and the glass seperates from the bottom base the leads will short out and you will blow your main curcuit board. Then the entire board must be replaced. It will blow out a component on the board or blow a trace off of the back of the board. either way either baord repair or replacement will be needed. ALWAYS UNPLUG THE UNIT WHEN REPLACING A BULB!!!!

Sep 18, 2017 | LG LMVM2075 Microwave Oven

1 Answer

LG microwave oven hot option failed


There is a built in triac switching semiconductor, when it fails the high setting is lost, it switches the power levels through incriments from low to high.

Apr 18, 2012 | LG Microwave Ovens

1 Answer

Power on, everything sounds & looks normal but not heating food. When I hit power level option it does not say high, medium or low any longer.


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic
Microwave Oven Troubleshooting Tips

heatman101


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Oct 03, 2010 | GE JVM1850 1000 Watts Microwave Oven

1 Answer

Microwave has no power


inside the microwave there is a low voltage power supply that powers the computer and display ... that is not working in your case .. if there is no low voltage power then nothing else will work .. there are several possible causes .. you can have a blown fuse on the low voltage power supply board (usually the main and only board) ... there is also a thermal fuse ... if the microwave magnitron got exceptionally hot then it could trip the thermal fuse .. this would kill power to everything else ... high magnitron tempratures can be caused by blocked air flow or running the microwave with nothing in it ... once the thermal fuse is tripped it has to be replaced ...there is also an over temperature switch that simply shuts off the power until the system cools , but this is self reseting unless it goes bad .. inside the microwave oven electronics are the most dangerous combination of high voltage and high current you will likely encounter in your life .. you simply have to know what you are doing in there ... this combination can be fatal in a fraction of a second ... your problem is inside there where its dangerous .. the low voltage supply and computer are not dangerous but the voltage they control is .. .. all parts that can cause this trouble are available for most microwaves so yes its repairable but think twice before opening .the case .. there are microwave repair centers around here .. the cost may or may not be reasonable since new microwaves are available for really good prices right now ....

Aug 18, 2009 | Microwave Ovens

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