Question about Panasonic Microwave Ovens

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I have a combination microwave (Panasonic) which does not heat up anything. Everything else operates as it should and even the grill works. I replaced the fuse as it had blown but it still doesn'

All other electrical parts functions normally except that it doesn't heat up anything. The grill works fine also.

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The magnetron is the likely problem, {heart of the microwave oven}

Posted on May 20, 2012

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Posted on Jan 02, 2017

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SOURCE: microwave blows fuse in microwave mode grill function ok

It is most likely the capacitor has shorted or the rectifier has shorted. Check with ohmeter, but make sure it is discharged first by shorting the capacitor with a wire.

Posted on Sep 09, 2010

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Panasonic Inverter combination microwave/convection unit. Microwave barely working, convection ok, problem part?


your issue sounds like low output from the magnetron, if this is the case replacement of the magnetron is the only solution, Here's a link for magnetrons on Amazon to give you an idea of the expense involved:
Amazon co uk magnetron microwave
you may decide to replace the microwave instead of repairing.

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I have a Panasonic combination microwave, NNA753. The microwave has stopped working. When I put it on with 1/2 cup of water in it, it runs for 27 secs and then switches off. I have tried doing this...


Magnetron fault. This requires service through an authorised Panasonic service department as it is extremely specialised due to the type of technology employed with this machine.
The unit is not heating in the time set by the sensor.

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Microwave not working but oven and grill do


Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

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ge microwave fuses are behind upper grill and behind right side grill

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Sounds like the microwave unit (magnatron) has failed. This will happen if the microwave has ever been used without anything in there to absorb the energy. It basically cooks itself.

Unless you are particularly fond of this unit, it is usually cheaper to buy a replacement than order parts and repair.

You could phone a few local repair centres and ask for a quote , but weigh this against the next thing likely to fail.

Worth repairing industrial models, not really worth repair to domestic models.

Hope this helps you.

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Bad power diode, bad power capacitor or bad magnetron

Google on 'microwave not heating' and you'll get some sources of information

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If you described this to Panasonic very carefully, and they said it's normal, then I would say keep using it until such time that you get other symptoms. The inverter has some parts mounted on a large chunk of aluminum called a heat sink. It draws the heat out of the parts and the heat radiates and/or convects away. This keeps the circuit parts from overheating. As long as you have good air flow through the vents, it sounds okay.

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