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The light comes on but the cooling fan and heat do not.

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Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Posted on Nov 07, 2010

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AMANA ACM1580AW WNONT HEAT


If the inside light, cooling fan, and turntable are not all coming on when you hit "Start" to cook, then you likely have a bad top or bottom door switch, or that switch's mount is loose, misaligned, or broken.

See these help files:
http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt
http://031d26d.namesecurehost.com/mwd/doorsw.txt

If the inside light, cooling fan, and turntable are all coming on when you hit "Start" to cook, then chances are you have a failed high voltage diode or magnetron or a bad connection at the magnetron.
You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Dec 05, 2013 | Amana ACM1580 Convection Microwave Oven

1 Answer

Mirowave not heat


When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here: http://031d26d.namesecurehost.com/mwd/mwd_ad_aug_2008_background.mp3

And what is your full model number from the tag on / in the unit?

These answers will help me judge whether it's in the high voltage section (magnetron, transformer, or diode) or the control section (door switch or control board relay or connection).

Please post a new help request with your brand and full model number from the tag and the answers to these questions so we can help you properly.

May 02, 2013 | Whirlpool Microwave Ovens

1 Answer

Microwave wont heat


We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.

Please post a new help request with that and more detailed symptoms, such as when it occurs.

When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Apr 15, 2013 | Sharp Carousel 1.5 cu. ft. Countertop...

1 Answer

My still fairly new kenmore 1000 watt microwave appears to be operating fine but doesnt heat. What might be the problem?


When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Post a new help request with the answers to these questions as well as the full model number from the tag on or in the unit.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Apr 14, 2013 | Kenmore 62622 Microwave Oven

1 Answer

Rival ModelRGST902 microwave will not heat. It is brand new


Please post a new help request with your full model number plus more detailed symptom information, including:

Do the inside light, turntable, and internal cooling fan ALL come on when you initiate cooking?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

These answers will help me judge whether it's in the high voltage section (magnetron, transformer, or diode) or the control section (door switch or control board relay or connection).

Jan 09, 2013 | Microwave Ovens

1 Answer

The power keeps shutting off


see the details and fix it. God bless you
All microwaves have some sort of a cooling fan to help keep the magnetron and controls at a tolerable level. Most OTR models will usually use the vent motor for the cooling fan also. Countertop units have a small fan behind the control panel somewhere. Either way, if the cooling fan is not working and heat builds up, it is going to open a thermostat. On some makes, this thermostat might re-set itself as soon as the temperature cools down. Other makes, you will have to replace the thermostat or fuse.
If this is your microwave oven repair problem, you will need to check the operation of the fan. Below in the component testing chart, you will see how to test the fan. Also, if possible, make sure the fan is not obstructed somehow and not turning. Also check your fan relay at your control board for voltage, if no voltage, replace control board. This fan should come on at the same time any cooking starts.

11_16_2012_1_10_51_am.gif

Nov 15, 2012 | Panasonic NN-SD697S Microwave Oven...

1 Answer

Westpoint microwave oven when it is switched on the power trips off


see this cause and fix it: Otherwise you must call a profesional repairman. You must act with carefully. God bless you
All microwaves have some sort of a cooling fan to help keep the magnetron and controls at a tolerable level. Most OTR models will usually use the vent motor for the cooling fan also. Countertop units have a small fan behind the control panel somewhere. Either way, if the cooling fan is not working and heat builds up, it is going to open a thermostat. On some makes, this thermostat might re-set itself as soon as the temperature cools down. Other makes, you will have to replace the thermostat or fuse.
If this is your microwave oven repair problem, you will need to check the operation of the fan. Below in the component testing chart, you will see how to test the fan. Also, if possible, make sure the fan is not obstructed somehow and not turning. Also check your fan relay at your control board for voltage, if no voltage, replace control board. This fan should come on at the same time any cooking starts.

9_17_2012_11_52_33_am.gif9_17_2012_11_53_23_am.jpg

Sep 16, 2012 | Westpoint Microwave Ovens

2 Answers

I have a GE SpacesaverXL model JVM1350BW. It does not heat up. The interior light, surface light, fan, clock, keypad all work normally. When a cooking mode is chosen and START is pressed there is a...


I wouldn't worry about the sensor error right away.

Sometimes that's just caused when the door is opened before steam could be detected or steam was not detected in the maximum amount of time.

Once it's all working again, if you still get the error regularly, it may be a bad humidity sensor.

If the internal cooling fan IS running when you try to cook AND the oven is not heating, it's probably a failed secondary interlock relay on the control circuit board.

If the internal cooling fan is NOT running when you try to cook AND it's not heating, the bottom door switch is probably the culprit.

Here's is a file on checking and replacing door switches.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

Listen to that very carefully, and listen to yours to see if the cooling fan is working.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Let me know if I can help you further.

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

Aug 22, 2010 | GE JVM1350BW/WW/AW/SY Microwave Oven

1 Answer

KCMS145JBL-1 stopped heating. It overheated, shut down, then eventually lights and sensors came back on. Still doesn't heat.


It's likely the magnetron overheated, and when its thermostat tripped, all power was interrupted for safety until it cooled back down.

You likely have a failed magnetron, which is sometimes due to a failed internal cooling fan or clogged filter.

Your owner's manual will help you on locating and checking the filters. Grease filters can be cleaned, but charcoal filters cannot, they must be replaced.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the turntable and stirrer won't work, and magnetron will soon be destroyed.

Sometimes the cooling fan will not run after the cooktop lamps have failed. A surge from the filaments shorting can cause damage to the control circuit board, resulting in odd operation from lights, fan, or turntable.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


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

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

Nov 28, 2009 | KitchenAid KCMS145J Microwave Oven

1 Answer

Nnt553w panasonic microwave. Whilst heating something he oven stopped and the display said refer to operating instructions. Now seems to be working but doesn't heat.


When you enter the time and press Start:

Does the inside light come on?

Does the turntable rotate?

Do you hear the internal cooling fan running?

Does the time count down?

May 25, 2008 | Panasonic Microwave Ovens

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