Question about GE JVM1850 1000 Watts Microwave Oven

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Blows internal fuses after replacing

Cooking baked potatoes blew the fuse. I reoplaced the fuse and screen lit up and I hit the clear button and lights flashed and blew another fuse. Talked with a local tech he said he knew just what it was but couldn't tell me because of liability. So do you know the quick fix or part I need..

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  • William Miller
    William Miller May 11, 2010


    Which lights flashed?

    Please reply back with your brand and model number so we can help you.

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Did you use correct fuse??? REMEMBER MICROWAVES CAN KILL EVEN WHEN UNPLUGGED
grandadfixer

Posted on Oct 11, 2008

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Panasonic Microwave NN-CT552W has no power - plug fuse ok - Has it got a thermal cut out or internal fuse? - Unit was ok after cooking some jacket potatoes


All microwaves has both internal thermal cut out and internal fuse, Yours problem sounds like an open 9 volts transformer that power up the front panel

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GE Spacemaker microwave makes groaning sound when start button is pressed for a second or two then blows the internal fuse. After replacing the fuse everything seemed to work, lights, exhaust fan, cl


Could be a lot of things but most probably a shorted high voltage diode assembly. If not that then the magaetron or capactors. Remember be careful there are high voltages even when the oven is unpluged. The capactors are usually charged and must be discharged. If you don't know what yor doing then time to get a qualfied tech.

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I have an Electrolux High Speed Oven E30SO75FPS that's 3 years old and the Magnetron has failed for the 3rd time. What can be causing this?


Is the internal cooling fan working?

Are the ducts and vents clear?

Problems with any of those can result in overheating, which destroys magnetrons.

I have seen high voltage rectifier diodes interact with magnetron in funny ways. I'd replace the diode, too.

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

Finally, baking potatoes and making popcorn really give the magnetron a workout.

You should put about 1/2 cup of water in the rear corner of the microwave when cooking those foods.

It helps "preload" the oven to prevent execessive microwave energy reflection back to the magnetron.

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happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Dec 12, 2011 | Microwave Ovens

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I have a JVM1850 1100 watts. It's not heating. Shortly after we got it I think a fuse blew because we always had to turn the vent on and then the cooking time which worked. Now, it stopped heating all...


There is usually a 125V, 20 AMP line fuse inside the microwave, mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven (if this is an over the range model), UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacturer and model. Parts are available at any of the following webistes: searspartsdirect.com pcappliancerepair.com appliancepartspros.com repairclinic.com The first three sites include illustrated parts listings that can help you locate and properly identify any parts you may need. If the model number you listed this question under is correct, the line fuse is connected in line with the power cord inside the unit and is listed as part of item 47 in the parts listing (part number WB27X10388). This microwave oven is also equipped with various thermostats that (if blown) can cause similar symptoms to that of a blown line fuse. So, if the line fuse is NOT blown, you may want to check all the thermostats to see if they are still good. You will need to remove each one and measure across the terminals with a multimeter. A good reading is 0 ohms. NOTE: The various thermostats are listed as items 27, 61, 74, and 77 in the parts illustration. The thermostats typically will trip if the oven cavity has been overheated. Cooking items that are high heat producers such as popcorn or baked potatoes in rapid succession can often cause this problem. Allowing the oven cavity to cool a few minutes with the door open between cooking can prevent this from occurring.


If the line fuse is blown, you can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. These ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find the internal fuse blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.

Sep 08, 2010 | GE JVM1850 1000 Watts Microwave Oven

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I was cooking 4 potatoes for 14 minutes then put in frozen corn, started the microwave oven again and everything shut down.is there an internal fuse or breaker? or is it time for a new one.


Many of these ovens have either a humidity sensor or oven cavity sensor that will shut the oven down if the internal oven cavity humidity or temperature exceed a certain level. Baked potatoes are often a culprit as they retain a good amount of heat and generate humidity when they cook. In most cases, allowing the oven to cool down with the door open for about half an hour will restore operation.

However, there is also a thermal cut-out (TCO) on some models that will trip if the internal temperature of the oven cavity gets too hot. If the TCO trips, it must be replaced.

Since you posted no Brand Name of Model Number, I do not know how your oven is configured. If you post back with this information, I can verify and may be able to diagnose a cause of your problem.

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Fuse blows on microwave switch on


one of three things shorted could cause this: H.V. diode,capacitor,or the magnetron tube, take screw driver and short terminals on capacitor before touching anything inside the case, then chk resistance on capacitor should show infinite after needle settles, diode should show hi resistance one way and a lower resistance in the other direction(use the RX100 scale not the RX1) on both parts diode should not show very low resistance or it could be leaking,mag is a different story,it can be chk'd but in a different way

Jul 24, 2009 | Panasonic NN-H275 Microwave Oven

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NEFF MICROWAVE OVEN BLOWS 10A INTERNAL FUSE


We had the same problem, got Neff service engineer to come out after taking out insurance. He said the megatron cracks which is a large magnet and causes the fuse board to blow and needs to be replaced. This occurs through lack of ventilation on instalation. Total cost £370 may as well get a new one. Plus our insurance wouldn't pay the cost and cancelled the insurance policy.

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Russell hobs microwave oven


I am a recently retired appliance engineer of 20 years, microwaves are not normally things worked on yourself, i would be reluctant to help normally but yes there is an internal fuse ( a special quick blow type )just inside where the wire enters the cabinet on a small circuit board, if a replacement is needed it must be exact match bought from an electronic shop, microwaves are dangerous they store powerful electric and can still shock after removing the plug, if the replacement fuse blows, there is a fault elsewhere, and i do not recommend further self repair, work with safety

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If the fuse blew as soon as you hit START to begin cooking, chances are you have a shorted high voltage capacitor. If it blew a few seconds after hitting START, then it's more likely to be a defective high voltager transformer. You may notice a buring smell. It's also possible that you have a defective thermostat / thermal cutout on the magnetron (especially if the oven has ever been run empty, arced or sparked, or overheated). In cases where the internal fuse blows, there's usually a cause, even if it's just a loose fuse holder. You can find exploded view diagrams and order parts by entering JVM1190SY here: http://tinyurl.com/gv383 We have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

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