Panasonic NN-H275 Microwave Oven - Answered Questions & Fixed issues

open it and check screws. anything that vibrates will sooner or later loosen internal screws. maybe put a locking ring on it if u find it ManualsLib Makes it easy to find manuals online serach here for service manual .

Remove fan and check for loose debris or screw that is hitting the fan.

kindly check door lever

Main board is faulty. If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/

I can think of several problems with that 1. Defective lights 2. Defective control board 3. Defective control panel, you just have to check one thing at a time.

Pc board faulty

try a company called e spares on the internet they do most parts or can find them

We see and repair this a lot. The problem is on the controller assembly.This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller. The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too. You can find a video here that shows you how to remove the grille & controller in about 5 minutes.

If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Now switch the microwave power on and use a cup of water to test. If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. Replace with same type. If not check the waveguides within the cabin for food particles that can burn and spark, check for rust that can corrode and spark when the ceramic paint has worn out. If there is heating without any issues, you can use the microwave safely

Click this link:Waveguide

behind the control panel,while your checking the h.v. cap check the h.v. diode for a shorted condition as this will also blow the 20 amp fuse too

Hello Two options to try: a) Press the Clock / Timer button 3 times b) Unplug, wait a few seconds, then re-plug to power up with the factory settings. You will need to reset your clock and any favourite settings.
This should work with all Panasonic Microwave models.
Good luck

The internal fuse has blown indicating a secondary problem, it may be one of the door switches is defective or a more serious issue.

Replace it,

This indicates a keypad control board problem.

The problem is in the keypad control board, replacement only option.

This could indicate a shorted turn in the magnetron, a cracked high voltage diode, or a shorted high voltage capacitor.

The problem is most likely caused by 1 or 2 bad door switces often the result of food partical build up, the latches will need to be replaced.

It may be a broken door open button, door open lever, or grease in the channel where the door open button moves in the control panel frame.See these files:http://wwww.microwavedisplay.com/safety.txthttp://wwww.microwavedisplay.com/disassembly.txtYou can order Panasonic parts from Encompass here but without part numbers, it may be best to 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.

Hi Colin, On our microwave , unplug first, husband just removed thewhole outer casing of microwave and pushed the button through the back, he did not touch the control panel. Hope this helpskind regardsChristine

What usually breaks is the door open lever.

On a counter top model, the outer cover will need to be removed to diagnose and repair this. On an over-the-range model, only the control panel needs to be removed.

Please unplug the oven first.

If you or someone you know wants to look into this, we have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Once it is apart, you'll be able to see how the door open button would press against the door open lever, which would then lift up against the door latch heads (hook-like projections on the door) and the door should open.

If you reply back to this with your brand and model number, we can steer you toward a part source, and possibly toward exploded view diagrams, etc.

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