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Microwave works only intermittently

It works, then it doesn't work. A little while later it works again. Is it overheating? if so, what if anything can be done about it? Unable to find owner's manual for this model

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I had this problem on my microwave and found it was the safety switch on the door , The little microswitch was badly worn , Mapplins provided a simple replacement for £2 and it still works 10 years on..Please make shure the microwave is unplugged before you attempt any repair..

Posted on Jan 22, 2009

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Oven on convection for 45 minutes sort of thud then went dead no lights nothing, fuse is ok came back to it 3hrs later and is working again?


That is usually an overheating problem. It may be due to blocked air flow, a slow convection fan, or a failing convection thermostat / TCO.

Jan 07, 2013 | Microwave Ovens

1 Answer

Ive got a d90d25eslr111-b1 micro combi,i poached an egg ani ie exploded in the micro,it blew the electic and went off,if i swith it on its ok,as soon as i shut the door it fuses the electric. why plea


see this causes and fix it. God bless you
If the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostats.
If the microwave runs for a few seconds and stops the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.
If the microwave runs for a few seconds and stops the high voltage transformer might have an intermittent short. This is not common. Check other components related to the microwave symptom first.
If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the dishwasher display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.
If the microwave runs for a few seconds and stops the touchpad and control panel might be defective. There are several other components that can cause this problem, be sure to check any other components before replacing this board.
If the microwave runs for a few seconds and stops there may be a short circuit in the main control board. Check other components first, these boards are often misdiagnosed.
If the microwave runs for a few seconds and then shuts off, a door switch might have failed intermittently. Check each of the door switches for any signs of overheating, arcing, or burning. Also check each of them for continuity. Replace any of the switches that is visibly damaged or that only has continuity intermittently.

Sep 27, 2012 | Morphy Richards Microwave Ovens

1 Answer

I Have a GE Spacemaker over the stove microwave. I think it is 1000 watts. It's 7 years old. Everything works but it doesn't heat anything. There is 23 volts going to the fan unit in the...


HELLO.

Since there is an amount of volts from the outlet, the fault is from the microwave breaker.

The solution is given below.

Reset the microwave breaker.

Take the back cover of the microwave off with a screwdriver.

Inside you will find a motor.

Most microwave motors have a small red reset button on them. Hit that button.

Your microwave should work again if the breaker was the issue.

Thanks

Sep 21, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave stopped working last night


If the microwave worked for a little while after you plugged it in again then it is just overheating.It is usually just dust/dirt collecting on the vents.the fan,and the magnetron(the thing the fan blows on).If cleaning all these doesn't solve the problem you may have a bad high temp overload sensor,and need to replace it.(this sensor is usually mounted directly on the top of the magnetron.The magnetron is the part that actually puts out the microwave signal.I've never seen a reset button.The high temp sensors reset themselves automatically.

Jun 23, 2009 | Panasonic NN-T654SF Microwave Oven

1 Answer

Whirlpool Microwave, No Power


could be a damaged door saftey

Jun 14, 2009 | Whirlpool Microwave Ovens

1 Answer

Microwave lights and buttons work but doesn't heat up anything


When you start the microwave say for 1 minute. Listen closely when you hit start, the light should come on and about a 1/2 second later you should hear a little click and a slight hum. This means the controller is turning on the high voltage transformer and that part of it is working. My guess is that the magnatron is bad. That's the most common problems with all brands of microwaves. The mat on the top should not have caused the problem since the microwave has heat shutdowns in it. I would say that it's a 90% chance it's the magnatron. Most microwaves have a 5 year warranty on that part. Look at your owners manual. Good luck.

Scott

Jan 23, 2009 | Amana Radarange Microwave Oven

2 Answers

Panasonic Dimension 4 microwave model NN-C703BBPQ not working. Display is not illuminated as if fuse has blown. Have changed fuse in plug, but still no visible sign of life. Anything obvious that might...


A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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

Jul 29, 2008 | Panasonic Microwave Ovens

1 Answer

NNP-294 Dead


If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you suspect the fuse at all, it's best to replace it.

With the microwave unplugged, if you can easily turn the fuse with your thumb & forefinger while it's in the holder, it has overheated and fatigued and the holder should be replaced.

Simply squeezing the holder's terminals together with pliers is not really a good solution.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

An intermittent door switch will not make the unit intermittently dead, it will only make it not heat, and depending on the model, it will also likely make the turntable and inside light not come on. But again it depends on the model.

You may need to clean and/or realign the door mechanism or door switch mounts.

This is especially true in case a user opens the door while it's cooking without hitting Stop first or slams the door. Both are big no-nos for a microwave.

The main parts that will kill the power are the fuse, fuse holder, or thermostat or thermal cutout, which are usually located on or above the magnetron and on the top of the cooking cavity.

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

May 20, 2008 | Panasonic NN-P294WF Microwave Oven

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