Panasonic NN-H264 Microwave Oven - Answered Questions & Fixed issues

Hi,# 1 Unplug the microwave from its electrical outlet. Never service an electrical appliance while it's plugged in.# 2 Remove the screws that hold the outer shell onto the microwave chassis. Often the screws are on the bottom or back of the microwave. Use a Phillips screwdriver or Torx driver to remove the screws.# 3 Lift the outer shell off the microwave chassis and locate the box that houses the halogen lightbulb. In most cases, the box is metal. It may or may not have a lid on it. If it has a lid, loosen the tabs and pull off the lid.# 4 Unscrew the halogen bulb and replace it with a bulb rated at the exact same wattage.# 5 Place the cover back onto the box if necessary and place the shell over the microwave chassis.# 6 Secure the shell to the chassis with the original screws and the screwdriver or torx driver.Regards.

I would need your full model number to help you best, but I'm guessing that at least it's a Panasonic?See if this describes what's happening:

• Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector

If so, see http://031d26d.namesecurehost.com/mwd/safety.txthttp://031d26d.namesecurehost.com/mwd/disassembly.txt http://031d26d.namesecurehost.com/mwd/doorsw.txt Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle. It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed. Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these. You can find an authorized Panasonic servicer here. In Canada, you can find an authorized Panasonic servicer here. If yours is not a Panasonic, please create a new post with your brand and model number so we can help you. We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

my over the range panasonic microwave turns off after 5 seconds????

The first most posible cause is the fuse inside is blown if the power supply is ok. You can remove the cover of the oven, and look inside at fuse. You can test power supply / inverter with a voltmeter to see if there is power to the main circuit board. Take care not touching the capacitor since is full of deadly high voltage

May I get the make and model # to help you more

press stop 3 times

You probably have a bad door switch or door switch mount.

See these files:
http://207.234.249.73/mwd/safety.txt
http://207.234.249.73/mwd/disassembly.txt
http://207.234.249.73/mwd/doorsw.txt

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

H97, mean that there's a problem with your inverter, magnetron, or digital programming circuit.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these. Thanks, Midwest-tek

You didn't mention your brand or model number, but I'll assume it's a Panasonic since you posted this under a Panasonic category.

See if this describes what's happening:

• Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector

If so, see http://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

If it stops after 7 seconds, it has a problem with the inverter.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.

Display codes H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

That may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

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

Either the fuse inside is blown, or the power supply is shot. You can remove the cover of the oven, and look inside at fuse. You can test power supply / inverter with a voltmeter to see if there is power to the main circuit board.

First unplug the mic
-Take down the mic
-Remove the three screws holding the plastic exhaust grill (the grill that exhausts air in to house... located front and top)
-Remove the two screws that hold the keypad
-Grab hold of the keypad and push up, then pull out.
-With the keypad out of the way look inside the mic you should see the 18v cylindrical ceramic fuse.
-Remove fuse, set meter to ohms and there should be no reading if the fuse is open (open means blown) if there is a reading it isn't the fuse... ???
-Reinstall new fuse... a 120v - 20amp fuse will do if you can find the original 120v - 18amp.
Smiles :-)
Robin Koykka

on the inside of the oven on the right you will find a small square of mica this is the wave guide cover have a look and see if it burnt or out of shape if it is then unplug the unit and remove and replace it make sure u clean the area where it sits as food can get behind the cover hope this helps

If unit is built-in reove screws holding unit to cabinet.
Slide out about 2 inches to access 3 screws holding grill.
Remove grill to get to two screws holding control panel.
Fuse is behind control panel,

Try unplugging the microwave for about 30 seconds, then plug back in. This may work. What you are doing is resetting the micro processor.

Microwave fuses are normally located either on a filter board near where the power cord comes in, behind the control panel between the door switches, or behind the control panel in a hodler, sometimes on the floor of the chassis.

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa.

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

You can find an authorized Panasonic servicer here.

You can order Panasonic parts from Tritronics, but if you don't find what you're looking for there, try here.

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

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Go back to the manual, and read the whole thing or just look at the Chapters names, and find teh right one, and hopefully that will answer your problems.


I am a myth, a myth surround by spirit and souls.
- Myth12 [ i love blogs]!

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

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

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com

High voltage parts are suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

This door screen as it's called protects the metal mesh screen from moisture and food debris. The door screen must be replaced or the mesh screen can arc and be damaged, which can lead to microwave leakage. You can order a new screen from Panasonic at: http://www.pasc.panasonic.com/Epartr/PartsListChoice.asp It may be this part: F31455H00AP DOOR SCREEN A 5.75 But it might be better to call Panasonic at 800-833-9626 and be sure this is the right part. Be sure to have your FULL model nuber (with suffix) when you call. Be sure to use a cleaner like acetone, etc. to remove all the old adhesive before applying the ne wone, or it will not stick. The door must be squeaky clean and dry.