Question about Microwave Ovens

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Panasonic NN-H503B. Now some years old. Switched it on at the plug this morning and it did the following: constant peep, peep, peep, accompanied by the display flashing 9/Beef 10/Pork, 9/Beef 10/Pork alternately. Just pressing 'Stop' does just that - everything stops but then the m/c is completely 'dead' - the display just shows a colon in the centre. If I switch off and back on at the plug , same thing happens. However, if I press any other pad the peeping stops and the display scrolls and shows 'Enter Weight' instead. Letting go of the pressed pad results in a continuation of peep, peep, 9/Beef 10/Pork etc etc. The only thing that will stop it is pressing 'Stop' which kills the m/c dead. I guess this is the programmer up the creek. Is this terminal or can it be re-set / re-booted somehow? Your advice soonest would be greatly appreciated. Thanks very much. Dave W.

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  • Dave_Wg Dec 13, 2008

    Thanks for your help. Oddly enough I idly tried the unit again late last night in passing "as you do", for no real reason - and, as you will already have guessed, it worked just fine. So far today it has has also behaved itself. Thanks again. Dave W.

  • Dave_Wg Dec 16, 2008

    The unit is not coming on or doing anything else by itself. However, I do think that the unit does now have a hard fault because if I get it to behave and then leave it switched on (so that it does not act the fool when I do switch it on), "something" keeps tripping the RCD at the mains supply. I don't think that it is co-incidence that while the unit is switched on, "something" keeps tripping the RCD because when I switch the unit off, the RCD does not trip. Therefore, for safety's sake, the unit is going to be replaced real soon. An extra Christmas present for us, I guess. Thanks for your advice. Have a good Christmas. Dave W.

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  • Microwave Ovens Master
  • 9,085 Answers

It sounds like you have a shorted pad ("defrost", maybe?) on the keypad.

If you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

If you would like to have us do this repair for you, we do that for $39.95 plus part costs.

Feel free to contact me directly (and please remind me of your model number) for more information & help.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Dec 13, 2008

  • William Miller
    William Miller Dec 15, 2008

    It's not unusual for them to be intermittent until they fail "hard".

    Heat / temperature may also be a factor.

    If the oven is coming on by itself or doing anything "by itself", this is very dangerous and can result in a fire.



    So until it is repaired,
    please leave it unplugged or leave the door
    open when it's not in use, and please do not leave it running
    unattended.

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



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