Question about Panasonic Microwave Ovens

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Fan continues to work after heating time

I do not understand why after the heating,time has finished the fan continues to work for a short time but the display indicates to open the door. This is a new purchase and the instruction book is not very helpful.

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This is to cool the oven faster

Posted on Jul 20, 2009


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Can it be used without the fan?

If you want to get anymore useful life out of it, stop operating it without the fan.

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Mine is a similar problem - light and fan BOTH stay on when the cooking/heating finishes! The door remains closed and the food/beverage cooks. However, when it's finished the light remains on and the

There are a number of interlock switches that the oven door activates when closed, sometimes one becomes defective causing the main fuse to blow in the microwave or continue to run when time is up.

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Maytag mmv4205bab continues to run after time is up. The fan does not circulate, but it continues to heat.

Our microwave in office won't shut off. It continues to heat and fan is running as soon as we close the door. Tried everything, unplugged, canceled everything. Please let me know what to do.

Oct 04, 2010 | Maytag MMV4205 Microwave Oven

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My whirpool oven is working but does not seem to be heating as it should I wonder if the fan is not working

magnetron do get week over time even more so if you do a lot of short time food reheat, the fan normally is used to cool the magnetron wave guide and if it stops working the over temp safety will trip and stop the magnetron from working

Apr 27, 2010 | Whirlpool MH1150XM Convection/Microwave...

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S/n 142627 Model nr. R-1406 over cabinet microwave. Does not heat, turntable turns, light comes on, but does not heat.  All buttons work. , Have tried pressing fan button.  It works but no...

This is probably a shorted high voltage rectifier diode, a bad magnetron, or maybe just a bad connection at the magnetron.

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.

The service manual is at our site here.

Accessing some part will require you to remove the oven from the wall, and the installation instructions (found here) makes that much easier.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:
(if it is NOT shorted or burned looking, it's probably fine)
(continuity can be good even though mag is bad!)

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Nov 27, 2009 | Sharp Microwave Ovens

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My JVM1851 model is 7 years old. Everything is working (light, fan, clock, etc). But food does not cook or warm. no heat!!!

As I understand your trouble, your 7 year old microwave does not heat.

I have found the most likely reason for this trouble is a burned door safety interlock switch.

To fix this trouble, remove the cover, find the switch opposite the door hinge. Test the switch for proper operation. You will need a continuity tester or a volt/ohm meter for this.

Let me explain what happens and you will be able to apply this to your situation. When you close the door these switches tell the oven the door is closed and it is ok to turn on the magnatron. If the switches are burned, they cannot tell the oven the door is closed - door not closed, no magnatron, no magnatron, no heat.

Why do they burn? Do you open the door while the oven is in operation? If you do, there is a spark at the tiny micro switch contact and they start to burn. Eventually, they will not close properly.

You can find replacement parts at a advertiser or a appliance parts store in your area or at

The next most likely problem is the start capacitor. This is the silver can inside. Please do not servic this item unless and until you understand the danger associated with it.

This device stores a very large electrical charge. Modern capacitors are supose to drain off the power after a certain amount of time. Some say it is OK to drain the opwer by shorting with a screw driver to ground. Frankly, I'm not a fan of this method. Please try the switches first ... if that doesnt work, post a note here and we can go to the next step.

I hope this solves your trouble and you are able to get your oven back in operation. If you will search this problem here at, you will probably find other ideas from other volunteer workers.

Thanks for using Please vote



Nov 09, 2009 | Microwave Ovens

1 Answer

The power is on; the time is right; the timer works.... but no heat. Help I used just the timer, and after that, it would not cook. It is only two years old (a built-in model.)

No heat can be a blown fuse inside the case, a shorted high voltage diode or a shorted stirrer bearing (a fan-like device mounted inside the metal waveguide near the area where the microwaves come into the cooking cavity).

Oct 08, 2009 | Microwave Ovens

2 Answers

KitchenAid KCMC155J

Sounds like a classic bad door switch or switch holder. If you or a friend decide to work on it, we have *critical* safety info, info on door switch testing and replacement, and oven disassembly info at our site, which is linked at our listing here on FixYa: You can find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here:

Mar 11, 2007 | KitchenAid KCMC155J Convection/Microwave...

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