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Repair guides and support for your Panasonic microwave.

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Microwave starts running as soon as the door is shut, but not cooking?

My microwave runs everytime I close the door. It doesn't cook anything, just runs the turntable and the light. It seems to be registering an error with the door, but not sure how to fix

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What ended up being the problem in your case? I have the same situation with my Samsung microwave

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Same here... "What ended up being the problem in your case?" I have the same situation with my maytag from 2014

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same here. Answers?

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In my case, I had to buy a new microwave. This was a problem with the old model (I can't remember the brand, off the top of my head). It was definitely a problem with the door and it somehow not registering that the door was latched all the way closed. I tried a few things like wiggling the latches around and cleaning them and that worked for a few days, and then it started up again. My microwave was only about 2 years old, but it was a super cheap one. I have since bought another cheap microwave and this one hasn't done this yet.

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When turntable be running or turning after a timer settings is finishing heating up

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Cause 1

Diode

The diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the diode.)

Cause 2

Door Switch

Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fails, the microwave will not start or heat. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches does not have continuity, replace it. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace a door switch.)

Cause 3

Magnetron

The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the magnetron burns out, the microwave won’t heat. The magnetron is not repairable—if the magnetron is burned out, you must replace it. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)

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This just happened to me. In my case, all I had to do was clean the door switch pieces on the door and inside and that allowed me to begin cooking again as normal. I'll keep an eye on it though because this is worrisome. This microwave isn't even 2 years old yet!

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It had to do with the door. I loosen the two screws that held the microwave up (over the range microwave) and that solved the problem.

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How did you clean it if its so dangerous I mean the way he talks I'd talk a qtip or something Mines when you shut the it starts running and won't shut off with timer Just suddenly started doing Its several years old Probably should just get a new one Never did figure our the grill part My old one quit my daughter gave me hers couldn't find the book so I was old & clueless Thank you for any help This site amazing So the people that leaves comments

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Our Hamilton Beach microwave is just a couple of months old & we just noticed it has started coming on & running by itself. It does go off when the door is opened, but resumes running after closing the door. Unplugging it & plugging it back in does no good. Neither does resetting or clearing it. And when it is running like this, none of the buttons work. That makes me think the problem is in the control panel. Still have the box, but not the Walmart receipt, so I guess we're at a loss unless electrician brother can fix it. This type of LEMON purchase hurts when you live on a limited income.

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Your credit card that you used to purchase is your receipt

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@thrumpin

I am facing exactly same problem. Did you figure out the issue with Hamilton Beach microwave

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I replaced the door switch mounting block that was worn out and when I got it back together the same thing was happening to me. The cooling fan ran whenever I shut the door. Come to find out I didn't notice that the little lever that operates the bottom switch wasn't on the new part. So once I took it off the old block and put it on the new block problem solved

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Yes!!!!!!! This is it. I was fuming, finally replaced all 3 switches and replaced the switch holder after blowing several fuses. Get it all back together then the stupid light and fan come on when you close the door. Why does God hate me I ask. I'm stupid, that's the answer. Forgot about that little lever. Thank you!

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Thanks Richard. I was fuming after going through the exact same steps. The new door switch mounting block did not have the lever too ? GE should supply the part by default.

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This issue is common amongst microwaves. The issue is within the control board. The main control board houses relays which have different functions. You can look at your wiring schematic and determine which relay (of I think 7 or 6) is the relay for power to cooling fan. Once you’ve located this relay, you can take an x-acto knife and cut the top completely off of this relay and you’ll see that the relay has fused together. Take a small flat head screw driver and pry the contacts apart and use a very small piece of sand paper to sand away any oxidized metal and reinstall control board. Unit should now function per manufacture specifications.

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My microwave runs when door is opened won't turn on when I got start

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My microwave works when door is opened but does not work when door is closed.

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Most sensible reply, thanks! So are you suggesting that relay should be replaced? I mean, if you cut the top off, then can you solder it back together? I guess I am missing the point. Thank you!

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i replaced the middle switch even though they all "clicked". Now the problem is intermittent. Are all of switches the same? I may replace the other 2 switches and the switch holder. Someone, please advise.... thanks

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Thank you all . on my RCA low cost microwave, the table kept turning, and I was unable to reset anything, nothing seemed to work. Thanks to all your comments, I just fixed it with a kid's paint brush. I put it inside the holes (microwave unplugged) where the door things go when door is closed and cleaned the inside of these holes (with a dry brush) and voilà, it works..

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I was actually looking for an answer here. My microwave (same model) after 2 years runs as soon as I close the door (intermittently). It’s not actually activating the magnetron as nothing warms up. No table movement, no heat, and no counter/timing display. The microwave still lights the inside lamp, and the fan still blows. I have seen this over the last 20 or so years and normally this problem is due to the door switch microwaves (easy fix…unplug the system from line voltage first and ohm out the switch when it closes = if it doesn’t change resistance {open/closed} it’s always closed). I can’t duplicate the problem using a plastic device to test this theory when on, with the microswitch closed physically by the plastic pot. turner stick and system on. Looked like possible magnetic switch on face of door, or where these “bumps” hit on the inside of the microwave front plate (I used a magnet thinking it used a “reed switch”) but that had no effect. Hope I added some simple troubleshooting here but would like it if someone else had a better response for my problem. Thanks to all, that’s how we help each other !!

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I had the same problem a few mins ago. Right after a major thunderstorm, even though microwave was unplugged. This is how I fixed it.

Unplug the plug from the electric outlet with caution, and very quickly plug it back in. It resets something inside the microwave with the sudden quick surge when u plug it back in very quickly.

Try it again - as I did -if it doesn't fix it completely the first time.

Exercise caution. Wear slippers, avoid contact with water.

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I wouldn't start plugging it in & out fast, you might end up puffing the unit with surges of electricity, and you might get zapped. If you don't know what you're doing, take it to a repaire person or better yet, for the price of them now, get a new one.

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Hey guys, i have been having the same issue with my microwave, where the the fan turns on as soon as the door shots. I read all the comments on what might be a potential cause of the problem and still couldn’t quite understand the problem. i found a potential fix while messing with mine, i have a standard 1200W cu whirlpool microwave, if you hold the cancel button for 3 secs it should lock the microwave even if the microwave door is open. And what that does is it prevents the microwave from being functional. you can close the door after you lock the micro wave and then hold for 3 secs to unlock. And that should stop the fan from turning on automatically after the the door shots. BUT my micro wave still couldn’t heat up my food after that trouble shooting. Try this out and let us know if yours heats up your food!! Thanks!!

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My NEFF microwave as soon as I plug it in it will turn on the light and the turntable slowly moving without heating, in this time won’t start heating. I fixed it by levelling it up.

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My Panasonic microwave displays 00:00 instead of 88:88 during startup and hence I'm not able to input commands..it as if its programming has reversed..can someone please help me

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Post above referencing a relay on the control board. Chances are it’s fused closed. But if you tap on it with a screwdriver it may free itself up. Use a tester to see if it’s closed and ensure it has opened.

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Hey gang, the light bulb seems to cause the problem with my sears unit

Update : WELL the lamp is not the trouble (new bulb = same trouble) But REMOVING the lamp, I can use the microwave ... I will need to study the Schematic Diagram... probably one on the boards connected to the Primary Interlock :-/

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GE OTR Profile MW. Stopped heating but cook time still counted down, light and turntable on. Removed control board, unplugged it, 3 micro switches and 2 temp switches. Waited 15 min, put it back together and it works. Happened a month ago also. What’s going on. Am I resetting it? It’s a pain for a 4 yr old unit. Piece of junk.

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I had this problem. It is the main (usually the largest) relay on the control board. I ordered some after tapping on the relay and it started working again. Just waiting for it to quit again to replace the relay. DO NOT BUY from a parts place. They get about 100x more than they are worth. See AliExpress.

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Thanks, do U have pic of the relay on the board?

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sorry for the delay, but mine finally quit again and I replaced the relay. It is the largest relay on the board with 2 tabs on top for the power leads. It is an HF 25F relay.

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FIXED - Cost zero - Thank you all for your comments. My RCA low cost microwave table kept turning when door was closed and nothing else was working, no matter what button I pushed, I could not reset . I used a small Kid's dry paint brush and cleaned the holes (with microwave unplugged) (where the door things go when door is closed and plugged it back on and voila it is working like before . I am no tech so this is the solution I came up with and it works...

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