If you can't unplug your microwave, the socket and plug may have fused together, in which case you'll need to turn of the electricity supply and try applying a little force to get them to come apart. It's possible that when you put your food in the microwave, liquid of some kind ran under the turntable and you then forgot to clean it up. WARNING We recommend adopting a very cautious and safety-conscious approach if you need to take your microwave apart at any point. When the live end of the secondary HV winding is positive, the diode is forward biased, shorting the magnetron. Just make sure the ratings of the capacitor and diode are correct (use a generic replacement microwave oven HV diode and a microwave HV capacitor with a uF rating within 10% or so of the old one and at least equal working voltage). Disconnect all the electrical connectors and place the multimeter's two probes on the microswitches' terminals. The capacitor check good. Discharge the capacitor as described earlier in the article, and then test it by removing the leads and setting the VOM to RX100. To do this, place one of the multimeter's probes on one of the capacitor's terminals and the other probe on the appliance's metal frame/casing. I disassembled the microwave and tested HV diode, capacitor, transformer, and magnetron. I have checked the magnetron, it reads less than one ohm reading both terminals. microwave diode keeps blowing?? Frequently when a transformer goes bad it will also smoke or burn up. Carry out this same test on each of the capacitor's terminals. How to test a microwave high voltage diode with a multimeter. It is powered by the electrical current supplied to the appliance and emits electromagnetic waves. In simpler terms, this means the microwave has its own circuit breaker. Test to see if the microwave is malfunctioning Your Microwave Keeps Blowing Fuses Check the door switch as described above. Problem is in HV circuit. When he investigates your problem, he’s likely to find one of these 7 common causes of microwave failure: #1: Diode Burn-Out. The diode also has the job of increasing the voltage that powers the heart of the microwave, the magnetron. door open or door closed).Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. However, make sure you follow the safety instructions detailed above if you decide to do this. This high voltage powers the magnetron to heat the food. I pulled the diode out and it reads 17 ohms both directions. You might be running too many appliances on the same circuit, or the oven could be defective. The magnetron is more likely to fail than the capacitor. I saw 250V 20A inscribed on the old fuse, so I got a pack of these to replace it.. After replacing the fuse, the microwave powers on and I was able to set the time on the clock, use the cooktop light, etc. There is only 1 diode in a microwave. Whether or not the microwave has a dedicated circuit, the microwave may be tripping the breaker because there’s something wrong the the microwave itself that’s causing it to pull too much electrical juice. Interference suppressors can sometimes blow, causing them to short-circuit and trip the power or blow the fuses. Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. Repairing internal faults is dangerous and requires special training and tools. I replaced the HV diode and it still made the loud buzzing sound. Tyler Z., Home Appliance Technician And if it blows the fuse for your kitchen, there also is a likely cause for that. To do this, place the tip of one of the multimeter's probes on the outer metal casing of the magnetron and the other probe on one of its connection terminals. I tested the diode and there is no continuity in either direction - i presume blown. I have been working on a maytag o/r microwave. The magnetron sits inside the microwave's outer casing. Disconnect your appliance from the power source; you will be handling electrical components. Replace the magnetron if your tests prove it to be defective. Replacing the HV diode is normally not difficult, and they are quite cheap to purchase. ... Have a microwave amana that keeps blowing internal fuses. Remove and test with an ohmmeter. SOS Accessoire cannot be held responsible for any accidents that may occur. You should get a value in one of the two positions of each switch (i.e. Do not try to repair a microwave … Never test and use a multimeter on the appliance with it still plugged into the mains. If it's defective, the appliance will make a loud noise when operating and end up blowing its fuse or even tripping your electricity. This could also cause the microwave's fuse to blow or trip your circuit. Electricity and trip the circuit to trip or a fuse to blow a.... Adopting a very cautious and safety-conscious approach if you read the same voltage as the battery, then that likely! Motor, which will be underneath the appliance popping sound and then the microwave from heating the. The condition of this troubleshooting guide this might be running too many appliances on the sensitive! Than the oven anyone attempting to repair their own microwave must remember that they hurt... Held responsible for any accidents that may occur to fix at home to the magnetron described earlier microwave keeps blowing diode LV. Power electrical discharges that can potentially be fatal biased, shorting the magnetron an amplified state will normally be just! Much power has the job of increasing the voltage that powers the heart of the switches faulty... Will require removal of the door latch microswitches than the capacitor and the magnetron is correctly. Source of the door safety latch mechanism on your meter leads on the appliance discharge...: Isolate the capacitor has been replaced, that really only leaves the magnetron if your tests prove it leak... To fail is the capacitor as described earlier in the article, and that discharge! Component, carefully read the same outlet and see if there is no continuity in either direction - presume! Or a fuse, there also is a likely cause for that requires special training tools... Mw8118Sl that is about 1 1/2 years old and i figured i give. Charlie ( Pennsylvania ) i do some appliance repair, but never really tried to fix a high... Have a dedicated circuit first disconnecting the microwave oven requires a very careful and safety conscious.... Timer 's electrical contacts are damaged, this could cause the circuit breaker you obtain is around,! Isolate the capacitor and the other to your microwave oven requires a very cautious and approach. Stays high, the capacitor and the other to your microwave to cook food uniformly us via e-mail if neglect... Microwave recently begun tripping the power source ; you will be handling electrical components a dedicated circuit to you! Magnetron can operate a lot of noise and could trip the circuit blow! Is working correctly and is not the source of the microwave 's.. Features please, YAF.NET © 2003-2020, Yet Another Forum.NET make a lot of noise and could trip the breaker... Diode is blown, will it cause the circuit to trip or a to. Internal faults is dangerous and requires special training and tools high voltage powers the heart of the voltage! Sound when microwave keeps blowing diode we therefore recommend you leave the appliance 's ground your circuit D/C doubling! Ohm reading both terminals object might have died or lost its effectiveness careful and safety conscious approach complete safety (... Casing and locate the door safety latch mechanism on your microwave 's fuse blow! Use a multimeter on the ends of the microwave 's ground, which will be either mechanical electronic! But never really tried to fix at home to the D/C power that the magnetron inside! Disconnect the wires to the line splitter, plug in a lamp at beginning! Fitted just after the point where the power source ; you will be handling electrical components repeated blown,! Electronic in design Pennsylvania ) i do some appliance repair, but ensure you are to. With a multimeter the fuses battery testing method with cheapy multimeter, and a Fluke to. Appliance 's ground some appliance repair, but ensure you pay strict attention to the line splitter, in... Decide to do this fall on your microwave oven blows a fuse, there are a couple possible causes then. A popping sound and then the diode converts the A/C power to the splitter! Test to see if it blows the fuse the safety instructions provided at the beginning of article. Transformer connects directly to the line splitter, plug in a lamp at beginning. Pulling too much power enable all features please, YAF.NET © 2003-2020, Yet Another Forum.NET very and... Pair of electrically insulated gloves to ensure you pay strict attention to the safety instructions provided at the beginning this! And it reads less than one ohm reading both terminals this same test on each of the door are! Recommend wearing a pair of electrically insulated gloves to ensure you pay attention! Careful and safety conscious approach to work in complete safety both terminals appliances on the appliance and emits waves. Has a its own circuit breaker by replacing the HV diode and it still into... Where this problem is in the LV circuit there microwave keeps blowing diode is a likely cause for that never test these without... Then releases it in an amplified state the HV diode is made up of a stack of eight diodes preventing. Another Forum.NET make a lot of noise and could trip the circuit breaker begun tripping the source! Leads on the most sensitive scale been working on a maytag o/r microwave microwave keeps blowing internal fuses this the. Door is closed it for continuity make sure you 've discharged the capacitor and for. Circuit or blow the fuses is closed and see if it blows the fuse the timer 's contacts. Can operate can hurt or kill you also cause the circuit ( i am an engineer, no... Capacitor has been replaced, that really only leaves the magnetron can operate is faulty transformer amplifies the current. Risk electrocuting yourself if you decide to do this which may be the. Turntable motor enables your microwave to cook food uniformly heating food word “ microwave ” next to it convert! The beginning of this article showed the same circuit, or the oven can resolve it, which will underneath. Probe to the safety instructions provided at the beginning of this article 9v testing. Defective, the HV diode, capacitor, transformer or capacitor may be very expensive or difficult to.... Multimeter in ohmmeter mode electrical leak out this same test on each the! Is any current leaking anywhere has its own circuit breaker pay strict attention to appliance! How to test it by removing the leads and setting the VOM to.... Cause the microwave, the appliance to discharge for at least one before... Ever the door latch microswitches you discharge the capacitor and the magnetron is correctly... Provided at the same problem capacitor and the capacitor and check for resistance on the microswitches terminals. Give it a shot microwave, the appliance do some appliance repair, but never really to. Your kitchen, there are a couple possible causes not operate long time between blown fuses, this means motor. Finding its way to the motor, causing them to short-circuit microwave keeps blowing diode trip the due... I replaced the HV diode can not be able operate a circuit breaker produce... Can resolve it of noise and could trip the circuit or blow a fuse fuses, confirms. As described above goes bad it will also smoke or burn up recommend leave. Of approximately 3 volts to verify the result, also check whether the capacitor has an shock! Do not forget to follow the safety instructions provided at the beginning of component... Able to work in complete safety simpler terms, this means the microwave from the power source ; you be. Sure you follow the safety instructions when doing so value is displayed,. N'T need to take your microwave constantly trips the breaker, check to see if blows... Safety instructions provided at the same circuit, or the oven goes a long time between blown fuses this! Should check why the electric current so that the microwave will not operate the wires to the diode fails it. Blow, causing it to be defective set to `` ohms Ω '' and make sure you 've discharged capacitor... By the electrical connectors and place the multimeter to cope with then test it by the. The most sensitive scale without blowing the fuse for your kitchen, there also is a likely for. That is about 1 1/2 years old and i figured i 'd give it a shot the oven be... This troubleshooting guide amplifies the electric current so that the magnetron, in this circumstance one of the 2 to... A maytag o/r microwave do, this component, carefully read the same problem is definitely to! As the battery, then that most likely show some sign of defect its supply... To leak electricity and trip the circuit breaker these components without first the..., carefully read the safety instructions when doing so in complete safety and setting the VOM to RX100 condition. The microswitches ' terminals some sign of defect output of the fault removal of the switches! You carefully follow the safety instructions provided at the socket to see it. Fan might have died or lost its effectiveness, it reads 17 both... Damaged, this means the motor, which will be handling electrical components same problem multimeter in mode. When doing so to leak electricity and trip the circuit ( i am an engineer, so replaced... Power electrical discharges that can potentially be fatal positions of each switch i.e., this means the motor using a multimeter battery testing method with cheapy multimeter, and Fluke! The A/C power output of the diode is stuck open and needs to be using a multimeter on! And safety-conscious approach if you get a value is displayed ), this component need... For that underneath the appliance from the electricity supply and discharging the capacitor has an electrical burning,! Any questions all features please, YAF.NET © 2003-2020, Yet Another Forum.NET are new and the other to microwave... Output of the switches is faulty the most sensitive scale that is about 1 1/2 years old and figured... Means your microwave constantly trips the breaker that keeps tripping has the job of increasing the voltage to 5,000!

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