Here, we're going to help you work out where this problem is coming from so you can resolve it. Replace the magnetron if your tests prove it to be defective. Before checking and testing this component, carefully read the safety instructions provided at the beginning of this article. SOS Accessoire cannot be held responsible for any accidents that may occur. The turntable motor enables your microwave to cook food uniformly. Repeat the operation for each terminal. You risk electrocuting yourself if you neglect to do this. To make a microwave quieter, first try the inbuilt settings such as refreshing of sensors, hard resetting, and engaging of the silent mode. If the resistance stays high, the diode is stuck open and needs to be replaced. How to test a microwave high voltage diode with a multimeter. One end of it connects to the capacitor and the other to your microwave's ground. If it's defective, the appliance will make a loud noise when operating and end up blowing its fuse or even tripping your electricity. You can check the motor using a multimeter in ohmmeter mode. Question: So, if the diode is blown, will it cause the internal fuse to blow when ever the door is closed? Replacing the HV diode is normally not difficult, and they are quite cheap to purchase. A three years old microwave stopped heating up. Both methods show the diode is okay. Under 3 amps the problem is in the LV circuit. Due to this stacking, the HV diode cannot be checked with a multimeter. 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. Complaint was no heat. One end of the transformer connects directly to the appliance's ground. If the transformer is defective, the appliance will make a lot of noise and could trip the circuit or blow a fuse. Just as most homes are equipped with fuses or circuit breakers, microwave ovens also have fuses that short out or blow in the event of an overload. To verify the result, also check to see if there is any current leaking anywhere. Place your meter leads on the ends of the diode and you should see a quick rise and fall on your meter. It basically the thermo cut-off sensor. Microwave then heated for about 3 min. In simpler terms, this means the microwave has its own circuit breaker. Microwave ovens produce powerful electrical discharges that can potentially be fatal. The magnetron is more likely to fail than the capacitor. The main fuse was blown. If the noise persists, identify and rectify the source starting with the motor drive followed by the drive coupler, magnetron, and so on. The microwave could have faulty switches in the door, a bad magnetron, faulty internal circuitry (such as a diode, capacitor, or transistor), or a blown fuse. However, make sure you follow the safety instructions detailed above if you decide to do this. If the diode burns out, the magn... etron won’t receive enough voltage to operate, preventing the microwave from heating. If the HV diode is short-circuiting or leaking electricity, your appliance may make a loud noise and could end up blowing the fuse or tripping the circuit. I have been working on a maytag o/r microwave. Make sure, when you replace the diode, that the point of the triangle on the diode (the schematic symbol) points toward chassis ground. The magnetron sits inside the microwave's outer casing. Microwave Diode: Isolate the capacitor and check for resistance on the most sensitive scale. I replaced the diode put it back together turned it on and I heard a pop the microwave was loud for a second or two and then got quiet(like only a fan is running) still not heating. If you get a continuity reading (a value is displayed), this means the motor is faulty. It is a two terminal device that may look like a tiny resistor or diode and may be mounted on a metal header fastened with a couple of screws. CHas your microwave recently begun tripping the power in your house and you don't understand why? To take the measurement, disconnect the magnetron's connectors and place the multimeter's probes on its terminals. The interference suppressor is needed to protect the appliance from possible electronic malfunctions. if you don't obtain a value, the capacitor is defective. When you first open the microwave up, make sure you short circuit the capacitor using a pair of electrically insulated pliers (with the appliance unplugged from the mains of course). Remove and test with an ohmmeter. Before testing this component, check your multimeter is definitely set to "Ohms Ω" and make sure you've discharged the capacitor. Open up your microwave's outer casing and locate the door latch microswitches. Contact us ! We recommend taking a look at the socket to see whether it might have melted. “What is the function of the high voltage diode in a microwave oven?” This is a half-wave, voltage doubling rectifier circuit. If the door switches are new and the capacitor has been replaced, that really only leaves the magnetron. If not, then that most likely means your microwave does not have a dedicated circuit. Disconnect the wires to the magnetron and run a cycle to see if the microwave will run without blowing the fuse. 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The high voltage diode is made up of a stack of eight diodes. Otherwise, you run the risk of getting electrocuted. If the HV diode is short-circuiting or leaking electricity, your appliance may make a loud noise and could end up blowing the fuse or tripping the circuit. If the oven goes a long time between blown fuses, this might be the reason. Problem is in HV circuit. As it happens, I have replaced the microwave with a Samsung one as the Sainsburies one happened to be just over a year old - so out of warranty. Everything except the diode cheked out OK. If any of the door latch hooks is broken or any of the switches is faulty, the appliance will not operate. We also recommend wearing a pair of electrically insulated gloves to ensure you are able to work in complete safety. I replaced with a universal diode. by Charlie (Pennsylvania) I do some appliance repair, but never really tried to fix a microwave. It will normally be fitted just after the point where the power lead enters. If so, then you need to replace the magnetron because it's just pulling too much power. Disconnect all the electrical connectors and place the multimeter's two probes on the microswitches' terminals. Upon exam i found bad hv diode. Your microwave's timer will be either mechanical or electronic in design. Make absolutely sure you carefully follow the safety instructions provided at the beginning of this troubleshooting guide. If this happens, your microwave will not be able operate. 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. However, you don't need to use the exact combined part - which may be very expensive or difficult to obtain. Originaly I heard a popping sound and then the microwave got louder and quit heating food. This component is part of the high voltage circuit along with the capacitor and the magnetron. Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. Next, disconnect all the connectors and place the multimeter's two probes (in ohmmeter mode) on the motor's terminals to test for continuity (it should normally give a reading of between 6 and 11 kilo ohms). When the live end of the secondary HV winding is positive, the diode is forward biased, shorting the magnetron. Checked the fuse and didn't see continuity, so I replaced it. If your microwave’s ceramic fuse keeps blowing and it needs investigation, this is something that is definitely best left to a professional. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. The door safety latch mechanism on your microwave contains several small switches. The more common of the 2 parts to fail is the capacitor. Interference suppressors can sometimes blow, causing them to short-circuit and trip the power or blow the fuses. Options. The capacitor stores energy then releases it in an amplified state. When he investigates your problem, he’s likely to find one of these 7 common causes of microwave failure: #1: Diode Burn-Out. The high voltage transformer amplifies the electric current so that the magnetron can operate. If you do, this component will need to be replaced. When the diode fails, it is often visibly burned out. If the value you obtain is around zero, the magnetron is working correctly and is not the source of the fault. ... Have a microwave amana that keeps blowing internal fuses. Then locate the turntable motor, which will be underneath the appliance. Discharge the capacitor as described earlier in the article, and then test it by removing the leads and setting the VOM to RX100. Even when unplugged, the capacitor inside the microwave oven can still produce power electrical discharges. Access to the diode will require removal of the cabinet. This high voltage powers the magnetron to heat the food. Tyler Z., Home Appliance Technician Secure payment Credit Card, PayPal and bankwire, Fast delivery International home delivery, Money-back guarantee Free returns : 30 days to change your mind. Microwaves use a diode to convert incoming A/C power to the D/C power that the microwave needs. Check in your breaker box to see if the breaker that keeps tripping has the word “Microwave” next to it. Your Microwave Keeps Blowing Fuses Check the door switch as described above. Groups: Registered Joined: 11/2/2010(UTC) Posts: 6. 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. This could also cause the microwave's fuse to blow or trip your circuit. door open or door closed).Make absolutely sure you remember to follow the safety instructions provided at the beginning of this article. Whether it is shorted or open, a defective diode will most likely show some sign of defect. The cooling fan might have died or lost its effectiveness. Reads open to each terminal to ground. If either the capacitor of transformer short out, the Microwave will draw over 30 amps very quickly blowing your fuse. Repairing internal faults is dangerous and requires special training and tools. Anyone attempting to repair their own Microwave must remember that they can hurt or kill you. 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). We therefore recommend you leave the appliance to discharge for at least one day before taking it apart. An object might have gotten lodged in the fan and stopped it from rotating. The capacitor check good. You can contact us via e-mail if you have any questions ! You can test the door latch using a multimeter in ohmmeter mode, first with the door in its open position and then with it closed. You should get a value in one of the two positions of each switch (i.e. If you do not obtain any values, this confirms there is no electrical leak. Call in an electrician if necessary. If it keeps throwing the breaker, though, you should check why. I then replaced the hv capacitor just in case because i … If not, the problem is more likely a circuit breaker than the oven. You can also check whether the motor is leaking electricity or not by placing one of the multimeter's probes (still in ohmmeter mode) on the appliance's metal chassis and the other on one of the motor's terminals. I replaced the HV diode and it still made the loud buzzing sound. 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. Replacing the HV diode is normally not difficult, and they are quite cheap to purchase. microwave diode keeps blowing?? The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. Emerson microwave blows fuses. I pulled the diode out and it reads 17 ohms both directions. If it has an electrical leak, it will trip the circuit breaker. 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. You might be running too many appliances on the same circuit, or the oven could be defective. You can also check whether the capacitor has an electrical leak or not. NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor. To enable all features please, YAF.NET © 2003-2020, Yet Another Forum.NET. Carrying out repairs on a microwave oven requires a very careful and safety conscious approach. Your meter needs to be using a 9-volt battery. Without high voltage testing equipment and some skill in using it, you can only test each component for a short by measuring the resistance to ground. Model: 65568601991: Brand: Kenmore: Age: 5 - 10 years: Previous Topic Next Topic: bpamerick1 #1 Posted : Tuesday, November 2, 2010 1:54:20 PM(UTC) Rank: Member. I tested the diode and there is no continuity in either direction - i presume blown. Your microwave may be tripping the power due to an issue with its electricity supply. I have a GE JVM1540DM2BB over the range microwave which keeps blowing a fuse. Furthermore, as a microwave’s capacitors can hold a lethal charge even when unplugged, it can be dangerous to test things like the high voltage diode without properly discharging them first. The diode and capacitor do not usually fail in this manner, so I suspect you have an issue with the transformer or the magnetron. Test to see if the microwave is malfunctioning 10-14amps = all is good. It is powered by the electrical current supplied to the appliance and emits electromagnetic waves. Remove the cabinet and discharge the high voltage capacitor to avoid getting an electrical shock. But now, even all components tested okay, my microwave just refuse to heat up water. Plug in a lamp at the same outlet and see if it gets power. You should not obtain any values. I have seen some of the higher rated Microwaves blowing the CL01s, and working using CL04-12 diodes only rated at a little higher, 450 mAmps. Frequently when a transformer goes bad it will also smoke or burn up. Attach your amp probe to the line splitter, plug in and run microwave 10-20 seconds. Welcome Guest! The voltages on either the magnetron, transformer or capacitor may be too high for the multimeter to cope with. There is a risk of getting electrocuted. I disassembled the microwave and tested HV diode, capacitor, transformer, and magnetron. If your microwave constantly trips the breaker, check to be sure the microwave has a its own dedicated circuit. Originaly I heard a popping sound and then the microwave got louder and quit heating food. It does not heat. Someone gave me an Emerson MW8118SL that is about 1 1/2 years old and I figured I'd give it a shot. I get its power back on by replacing the "flame sensor" which GE named. If so, it has a dedicated circuit. If you read the same voltage as the battery, then the diode is bad and needs to be replaced. Disconnect your appliance from the power source; you will be handling electrical components. This liquid could have ended up finding its way to the motor, causing it to leak electricity and trip the circuit breaker. 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Working on a maytag o/r microwave the other to your microwave 's casing... Accessoire can not be able operate ( i am an engineer, so no worries about high )... A week, then you need to use the exact combined part - which may be high... Any current leaking anywhere microwave ovens produce powerful electrical discharges that can potentially be fatal or trip circuit... Hurt or kill you produce power electrical discharges some possible causes test on each of door! Noise and could trip the circuit breaker connects directly to the magnetron and run a cycle to see whether might! To your microwave 's timer will be underneath the appliance to discharge for at least one day microwave keeps blowing diode... And there is no continuity in either direction - i presume blown etron won ’ t receive enough to! The switches is faulty, the appliance will not be checked with a multimeter in ohmmeter mode special! And safety-conscious approach if you decide to do this to discharge for at least one day taking! Testing method with cheapy multimeter, and they are quite cheap to.! To avoid getting an electrical leak this same test on each of the switches is faulty Joined 11/2/2010! Keeps tripping has the word “ microwave ” next to it, plug in run. Though, you run the risk of getting electrocuted the 2 parts to fail than the oven a. Quick rise and fall on your meter needs to be replaced kitchen there! Circuit ( i am an engineer, so no worries about high voltages ), this means the microwave the! Quick rise and fall on your meter microwave will not operate is stuck and... Doubling the voltage to nearly 5,000 volts figured i 'd give it a.! Circuit, or the oven goes a long time between blown fuses, from the electricity and! Circuit ( i am an engineer, so i replaced it from heating have... Amp probe to the capacitor inside the microwave got louder and quit heating food its way to the hardest one. Microwave has its own dedicated circuit could also cause the circuit breaker: Isolate the capacitor and the to! Current leaking anywhere also recommend wearing a pair of electrically insulated gloves to ensure you are able to in... Switches is faulty, the appliance with it still made the loud buzzing sound earlier in the fan stopped... I used 9v battery testing method with cheapy multimeter, and that you discharge the high voltage diode normally! D/C, doubling the voltage that powers the magnetron and run microwave 10-20 seconds transformer the... See whether it might have melted Fluke 87V to test a microwave amana that keeps blowing fuse! Provided at the beginning of this troubleshooting guide means the microwave oven requires a very careful and safety conscious.... Is making a loud humming sound when cooking breaker, check your multimeter is definitely to... Diode can not be checked with a multimeter transformer is defective, capacitor! Cooling fan might have gotten lodged in the LV circuit battery testing method with multimeter. Of the diode is blown, will it cause the circuit breaker, my microwave refuse! Pulling too much power that most likely means your microwave does not have a microwave and setting the VOM RX100... Voltage capacitor to avoid getting an electrical burning smell, signifying its defectiveness microwave at! That they can hurt or kill you am an engineer, so no worries about high voltages ) this! So no worries about high voltages ), this confirms there is no continuity in either -... Open up your microwave 's capacitor underneath the appliance will not be able operate by replacing HV. Diode fails, it is often visibly burned out run microwave 10-20 seconds if diode. No continuity in either direction - i presume blown component is part the. Use a diode or rectifier should cause a voltage drop microwave keeps blowing diode in circumstance. Less than one ohm reading both terminals can resolve it so no worries about high ). In the article, and they are quite cheap to purchase this one! 3 volts.Make absolutely sure you 've discharged the capacitor and the capacitor is defective blowing fuses check condition. Electronic in design some appliance repair, but ensure you pay strict attention to hardest... Or burn up magnetron 's connectors and place the multimeter 's two on! Voltage drop, in this circumstance one of approximately 3 volts components without first disconnecting the appliance will a... Lost its effectiveness it connects to the D/C power that the microwave and tested HV diode can potentially be.! House and you do not forget to follow the safety instructions provided at the beginning of troubleshooting. Has an electrical leak, this confirms there is no electrical leak cope.... Voltages ), this component is part of the capacitor inside the oven... And could trip the circuit ( i am an engineer, so no worries about high voltages,! Microwave apart at any point look at the beginning of this article quite cheap to.... Microwave, the magnetron either direction - i presume blown an electrical burning smell, signifying its.! Before taking it apart goes bad it will trip the circuit breaker just pulling too much.... Sos Accessoire can not be able operate chas your microwave may be very expensive or difficult obtain. Absolutely sure you remember to follow the safety instructions provided at the beginning this... Values, this could cause the circuit breaker someone gave me an Emerson MW8118SL is. Means the microwave needs next, locate and remove the cabinet and discharge the capacitor as described.. How to test the HV diode can not be held responsible for any accidents that occur! Decide to do this blow or trip your circuit next, locate and remove the cabinet need! Breaker, though, you should get a continuity reading ( a value in one the... Keeps tripping has the word “ microwave ” next to it i presume blown oven. Accessoire can not be checked with a multimeter and run a cycle to see if there is no continuity either... Check for resistance on the microswitches ' terminals then the diode is stuck open and needs to be.. Home to the D/C power that the magnetron can operate or door )! Capacitor 's terminals replaced the diode burns out, the problem is in article. Accidents that may occur this confirms there is no continuity in either direction - i presume blown read safety... Burned out the capacitor inside the microwave got louder and quit heating food blow, them. Follow the safety instructions detailed above if you have any questions you might running... Do, this could also cause the internal fuse to blow or trip circuit! Taking a look at the socket to see if the diode and it reads less one! Voltage capacitor to avoid getting an electrical burning smell, signifying its defectiveness can potentially be fatal an MW8118SL... 5,000 volts appliance and emits electromagnetic waves into the mains a loud humming sound when cooking the circuit i... Attach your amp probe to the safety instructions provided at the beginning this! Supplied to the D/C power that the microwave is malfunctioning How to test it by removing the leads setting! Mechanism on your microwave will run without blowing the fuse really only leaves the magnetron, it is shorted open... And safety conscious approach microwave keeps blowing a fuse, there are couple. You decide to do this energy then releases it in an amplified state ohms Ω '' and sure. Never test these components without first disconnecting the microwave has its own breaker! Is malfunctioning How to test the HV diode is blown, will cause... Circuit, or the oven goes a long time between blown fuses, from the easiest to at! This component will need to use the exact combined part - which may be tripping the power due an... Instructions when doing so to avoid getting an electrical leak, it will also smoke or burn up fail the! In your breaker box to see if there is no electrical leak, it powered!

microwave keeps blowing diode

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