Question about Panasonic NN-H664 Microwave Oven

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Where is the fuse?

My micro oven just suddenly go non-operational, the power is totally gone. I have to check whether the fuse has jumped, but failed to find the fuse, and failed when tried to open the back of the micro oven.. any help is REALLY appreciated..

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The fuse is internal and you will have to remove the cover to be able to access it. Unplug the unit. Once you remove the cover, follow where the power cord goes into the unit. The fuse should be in that area. Replace the fuse with the EXACT value of that of the original one.

If the fuse blows again when you put the cover back on and turn it on, then this indicates that you have a problem in the power supply or with the magenetron.

Please let me know if I can be of further assistance to you.

Good luck!
- Jim

Posted on Feb 13, 2008


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Posted on Jan 02, 2017


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Hi and welcome to FixYa, I am Kelly

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- The most common failure is the power diode. You remove the chassis to gain access and then make sure you hold a screwdriver by the HANDLE and ground the large capacitor at least 3 times across the terminals. Then you can check the diode by using an ohm meter across the terminals. It should read continuity in one direction only. (reverse lead polarity) If it reads in both directions OR there is no continuity then the diode has failed.
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The fuse should be a 15 Amp 125 VAC Slo-Blow Fuse. Available at any hardware or Appliance parts source.

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