There is no power to the unit at all circuit breaker not tripped
My daughter said it made a strange noise then shut off completely, there appears to be no power to the unit at all, no lights, no display, no anything. I checked the circuit breaker and nothing was tripped. Gas stove display is on the same circuit and it works fine. Any ideas??
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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"
I would suggest you check the door switches inside the microwave oven just below the keypad, rectangular in shape. The switches are normally open or closed, set meter to ohms, unhook lead from one side and test with door open and closed. If readings are the same both ways the switch is defective. "check all switches"
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.
your power transformer for the magnetron could have a shorted primary power winding,the door safety interlock switch could be mis-adjusted,this normally blows the internal unit fuse,a shorted high voltage capacitor,or diode,a bare wire inside the unit,more than the microwave on that circuit or a weak circuit breaker in the house power panel
These machines seem prone to having a bad magnetron. Look for a circuit breaker near the power cord entry point. If tripped, reset and try to heat a cup of water. If it makes a loud buzz and then pops the breaker again, the consensus view is a bad magnetron. This is one repair that is recommended to send out. (~$150). You need to evaluate the probable cost vs a new machine.
Check what other appliances are on your circuit. What goes off when the breaker is tripped. You may need to relocate the microwave to a different circuit. Try to stay away from the refrigerator or AC circuits.
Fan turned on after cooking because a thermostat got to hot and tripped turning on the fan to try to cool the unit. The unit went completely dead when thermal fuse tripped which is located above the cavity on the left side.