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LG LRM2060ST trips circuit breaker sometimes

I have an LG LRM2060ST which trips a circuit breaker immediately upon starting about 1 in 4 times it is run. It will do this for small items (coffee cup) or larger ones. It is on a 10A circuit breaker and worked fine in its present position since I bought it 1 year ago until recently. I have moved it to another location with a different breaker and it has the same problem. The microwave's label says it is rated at 14A. Is this a problem with the microwave or was I lucky it worked reliably for a year and the breaker supports too low amperage?

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  • gary kohls Jan 13, 2009

    Yes, thanks. Microwave has 'almost' dedicated circuit - range's hood is also on same circuit. 12g wire is present at breaker though I don't know about entire run which worries me a little. House dates to 1988 and is in Illinois. Will check wire gauge at microwave. Assuming that is also 12g, will replace with 20A breaker and will add a surge protector as suggested. Think 10A breaker was installed when I had house upgraded from 150A to 200A service and larger Square D load center installed about 5 years ago.

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Needs to have circuit of its own rated @ 20 amps powered by # 12-2-wg wire , also very good idea to plug into a good surge protector to protect its control board, as any computer the boards are very susceptible to spike voltage caused by lightning and power problems , as to how it worked before , breakers vary a little in the amount of current it takes to trip them with age , the number of time they have to be reset and heat they have been subjected to over a period of time so it is not unusual for say one 20 amp breaker to trip @ 16 and another @19 for example also the length of wire between the breaker and the appliance can effect the trip range

Posted on Jan 13, 2009

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The circuit breakers may both be functioning properly. What might be happening is that both circuits have other current drawing appliances on them. The circuit breakers react to the sum of all of the currents drawn by all of the devices on that circuit. So, if you have a 15 amp microwave and an 8 amp refrigerator on the same circuit, you would overload a 20 amp circuit by 3 amps.

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There must be a fairly major issue with your microwave to trip a 20 amp breaker. I would recommend taking it to your local repair shop or replacing it.

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Lg microwave oven trips circuit breaker


The magnetron probably has a partial short pulling more current than normal as it runs, the other two items that give trouble is the high voltage diode, "sometimes cracks" to the high voltage capacitor, "usually shorts"

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During the cooking for our Christmas dinner the temperature started declining from the 350 degrees to 280 degrees. We tried the top burner to make sure the stovetop was working and the whole thing shut...


Hi Jane,
Ouch! Sorry about the Christmas dinner. I sounds as though the circuit breaker tripped.
First, find the circuit breaker panel.

1 Check to see if a breaker has tripped. These breakers are double sided because stoves are
240 volt appliances, like the water heater or the house heater. There is a bar that connects
two single breakers together. The breaker will be slightly off center to the other breakers if it is tripped.
2 If it HAS tripped DON'T TURN IT ON YET
3 Go back to the stove and plug it in.
4 Turn on a top burner(not the one that may have tripped the breaker) preferably one that you know works that you don't use very much.
5 Go back into the garage and turn on the breaker.
6 If it goes on OK go back to the kitchen. You have done the first diagnostic test.
7 Check the burner to see if it is getting hot. If it is, turn it to high and then turn on the burner that blew the breaker in the first place. See if it blows the breaker again. If it does not. Turn on all of the burners that you know work. You have now done several Diagnostic Steps that are important.
8 If one of the burners trips the breaker, you have one of the culprets. If not, GREAT.
9 Shut off all of the burners
10 DO NOT TURN ON THE OVEN
11 Open the oven door and look very carefully with a flashlight at the bottom bake heating element. Look at the the entire element. If it blew (similar to when a light bulb blows) you will
find white powder around the hole in it or it will be completely broken, or have bubbles in it. Some indication like that. If so it has failed and must be replaced.
12 There is one other rare possibility, but it would not have blown the breaker. Many ovens have clock baking timers. These timers will, shut down the oven. If someone adjusted the timer and didn't turn the knobs in the exact right position. It will ruin the party shutting down the oven at the worst time. But it won't shut the stove top burners down.
IF YOU HAVE FUSES INSTEAD OF BREAKERS
If you have fuses instead of circuit breakers, Find several of the large cylinder shaped fuses to conduct the diagnostic tests I suggest. They are usually available at home depot.
RARE PROBLEM
One last but very rare occurence with breakers is their specifications sometimes change over a long period of time. If that is the case, they will trip and lower and lower overload levels. Simply Replace.

I hope this helps,
Good Luck
Best Regards,
Mark

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1 Answer

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from online Microwave Repair Manual: Totally dead oven (no lights, no clock, no display, no fan, no heat...)First, check power to the outlet using a lamp or radio you know works. The fuse or circuit breaker at your service panel may have blown/tripped due to an overload or fault in the microwave oven or some other appliance. You may just have too many appliances plugged into this circuit - microwave ovens are high current appliances and should be on a dedicated circuit if possible. If you attempt to run a heating appliance like a toaster or fryer at the same time, you *will* blow the fuse or trip the circuit breaker. A refrigerator should never be plugged into the same circuit for this reason as well - you really don't want it to be without power because of your popcorn!

If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.

The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.


While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.

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