My country use the 220 volts system do have to use a step down transformer of plug it in direct.it has been a year i have not used the appliance having no information on wattage

have it inspectied my a real company . if it was wired wrong, such as the oven was 220 volts and the microwave was 110 volt they tried to split the 220 down to 110 and wired it wrong. my question is was there a oven there before, if not did they run new wires for that oven . 220 volt needs 4 wires to run it , to be right. It sounds like 220 was put to the microwave.

A device which is designed for 110 volts MUST NEVER be used into a 220 volt outlet. This can damage the unit and make the motor winding burnt.
You need to buy a STEP DOWN TRANSFORMER with a good rating (220volt to 110 volt) so that the unit works perfectly without damaging the motor.

The machine is made to work with 120 volts and you have plugged this on a 220 volt mains circuit thereby blowing up the fuse, or the power circuit, possible heater and the main controller unit board.
A step down transformer was needed to work this unit safely . Now unless the unit is opened the damage cannot be confirmed but if you are lucky the fuse would ahve blown and saved the rest. if so test it with a new fuse using a 220 to 120 volt convertor.( transformer with good rating)

Unless the microwave oven is equipped with either an auto-transformer (which automatically compensates for the input voltage), or has a switch that you can change the voltage from 120VAC to 240VAC, you will need to buy a small step down transformer that plugs into the wall, and then you plug the microwave oven into. Keep in mind, however, that the frequency of the A/C voltage in the U.S. is 60hz. In Europe its usually 50hz. What this means is even if you are able to step down the voltage to use the appliance, the time will not be accurate. You will lose about 10 seconds per minute. Or, 10 minutes per hour. Something you may want to consider.

The indicator lights operate on 120 volts whereas the elements operate on 220 volts.
Using an electrical test meter go between the two hot legs and see if you are getting 220 volts. If not you have an open or non completed circuit.
Do not test from one leg to ground as you will probably read 120 volts for each leg. By reading across both legs you should get 220 volts.

You can't run the machine on 110 volts at all, because its heater is designed to work on 220. But you could have an electrician install a 220-volt outlet near where you want to use the machine. Then replace the European style plug on the machine's power cord with the appropriate American style so you can plug it in. This will provide the necessary power for the machine to operate.

There may be problems using the machine in this country though, beyond the voltage difference. European power-line frequency is 50Hz (Hertz, or cycles-per-second), while it's 60Hz in the US. This difference won't matter to the heating element in the machine. But your machine may not work properly if it has any electronic circuitry inside. There are two possible pitfalls.

First, the electronics in the machine will probably have a transformer in its power supply. That transformer will have been designed for a 50Hz line frequency. Running it at 60Hz might not be a problem, but it could also change the voltage seen by the rest of the circuitry, and this might cause damage. Also, some equipment uses the line frequency as its clock, which in this sense means more like a metronome, providing the beat by which everything else operates. Since our line frequency is faster, so is that clock, and this might throw off the unit's operation. A true time-of-day clock may run fast, for example, since it will gain time. Or the computer inside, if it has one, may not work correctly - or not work at all - if the line frequency is wrong. The only way to know would be to check the manual, which might say it doesn't matter, or to check the circuit board to see how it's designed.

So while the correct answer to your original question is "No, the machine can't run on American 110v", you may still be able to use it here. But without seeing the machine for myself, or having access to a manual to see what it says about power requirements, I can't tell you definitely. Hope this helps some, and thanks for using Fixya!

Find the breaker for it (a double for 220) and substitue a single breaker (for 110). This will leave one wire unused from the breaker box to the outlet. You'll have to change the outlet of course to accommodate a normal 110 plug. You can also skip the breaker part and just change the outlet and cap off 1 of the hot wires. Just make sure to kill the power and be safe!

no,not an inexpensive alternative

Ah, the problem of the ages. There are 2 solutions. One is a transformer of the proper size, and the second is to purchase a heavy duty battery charger (that runs on 220 volts). Connect the red and black (+ and -) wires to a 12v to 110v voltage inverter, similar to what you would plug into a 12v auto 'cigarette lighter' socket to produce 110v current from a car battery. The charger turns the 220 vac to 12 vdc, and the inverter turns the 12 vdc into 110 vac. This works, as it is what I did when I moved from the US to England.

You will need a step-down transformer of the appropriate power (wattage) and the proper adapter plug for the country you'll be in. You need to look on the back of the microwave and see how many watts it CONSUMES, not how many watts of cooking power it produces. Usually the power consumption requirement should be in the ballpark of twice the power output. For a 700W (cooking power) oven, I would suspect it has about a 1400W power consumption requirement, so your step-down transformer must be rated at least 1500W. That may be cutting it close, so for lower heat and longer transformer life, I would choose a 2000 watt model. You need to be sure it comes with an adapter plug that's made for receptacles in the country you'll go to. One site I found has them for about $60. but I would read up on the subject to see if you need one of an EVEN HIGHER rating since microwave ovens do surge when they start cooking. You may need to use one rated at 3000W or more. More info: http://www.dvdoverseas.com/store/index.html?loadfile=itemthg2000.html