Question about Microwave Ovens
When you close the microwave oven door, the latches operate some switches. One of them, the interlock monitor, is probably stuck closed or is out of adjustment far enough not to operate. When this happens, the circuit breaker will trip (or the fuse in the oven will blow) when you start the cook cycle. If the oven door gets slammed, this can damage the switch.
Another possibility is that the high-voltage (HV) rectifier diode is shorted. This mat be a separate part or it may be built into another piece called the HV capacitor.
The first step is determining the cause. An ohmmeter can be used to check the switch for proper operation and to see if the diode is shorted. The switch should change from very low resistance (nearly a short-circuit) with the door open to very high (open-circuit) when it's closed. If it doesn't behave like this, make sure the door latch is operating it correctly. If it is, the switch is bad. The diode should measure a very high resistance (close to infinite) with the test leads connected one way, and drop to a low value when the leads are reversed. A low reading in both directions means the diode is shorted. Then it's a matter of obtaining and installing new parts as needed.
MICROWAVE OVENS USE HAZARDOUS VOLTAGES WHICH CAN KILL YOU. Make sure the oven has been unplugged for some time before removing the cover. Then discharge the HV capacitor by momentarily touching its terminals to the microwave oven chassis using an insulated jumper lead. Some troubleshooting experience is helpful. If you aren't comfortable with your ability, be safe and let a professional repair the oven, or give an estimate for the cost of the repair. For a small countertop model, it may be more economical just to buy a new one.
If you decide to try repairing the oven yourself, be careful. Replacement parts are available from many online sources, and possibly locally if you have an appliance parts store or service shop in your area. Good luck, and thanks for using Fixya!
Posted on May 28, 2011
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Posted on Jan 02, 2017
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Apr 14, 2014 | LG LMV1813ST Microwave Oven
Either you have defected (weak) circuit breaker and wiring or bad Microwave oven.
The 99.99 % house hold Microwave ovens pull less than 15 Amps. They may have internal ceramic 15A fuse or 15 Amp internal circuit breaker.
To isolate your problem:
Plug your Microwave oven to different areas (different electrical circuit) if the different circuit breaker still trips... your Microwave oven has a short - Most of them has a small ceramic fuse 15 amps fuse.-also check some inter lock switches at door .
If the Microwave oven works Ok then you may have:
2a. You may overload the existing electrical circuit, try to unplug some other appliances
2b. You may have bad electrical outlet receptacle (Replace it with the same type , - may need helps from licensed electrician)
2c. Weak or defect house hold circuit breaker. (Replace it with the same type , brand - may need helps from licensed electrician)
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