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A small "L" may appear in the corner of the display as a reminder that the control panel is locked. If anyone tries to use the microwave, the display will show "LOCK".
You might have set the child's safety lock by accident by pressing the START button three times in a row. To unlock the child's safety lock, press the STOP/RESET three times in a row. Hope this helps.
"Locke" meaning the door? or locked meaning the buttons don't work? If it is the buttons then you have the child lock on. Push and hold the "Start" button for 4 to 5 seconds, and it will unlock.
On my NN-L738BA there is a Child Lock feature. You set the child lock by pressing the Start button 3 times. If the Child Lock is enabled it displays the word :CHILD".
To disable this feature on my microwave the manual says to press the Stop/Reset 3 times.
Not sure of the TT series models but for the NN series models the procedure is as follows:-
If "Child" is displayed in the display window, then the child safety lock is on.
To remove the child safey lock, press the "Stop/Reset" button 3 times in fairly short succession (less than 3 seconds). The time of day or just the Colon sign (:) is then displayed
If you later want to apply the Child safety lock, then, when the time of day (or colon sign) is displayed, press "Start" 3 times (again in short succession).
My microwave has a child lock on it.To set it all I need to do is press the start button for 4-5 second to lock and unlock. It may be something triggered it. It might be a quick fix until you find out what is causing it.
In all the models, when the child lock is on, the controller will then not respond to any input except that specific combination or held key which unlocks it.
You should also see a lock or "L" or some other symbol on the display.
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This model does have a child lock. If it's on, the display will say "LOCKED".
It is turned on and off by holding dfown the "0" key for 4-5 seconds.
You may also have a bad keypad, which in many cases can be replaced.
A bad keypad may be worn out due to age, damaged, or it may have gotten wet or otherwise contaminated.
Moisture and contamination can be caused by spraying of cleaners, by storing the microwave in an unheated garage or shed, or infestation.
I warn my customers to never spray cleaner directly onto the microwave keypad, since the liquid can get inside and "lock up" or even ruin the keypad or controller.
Apply an alcohol-based cleaner (such as the purple kind) to a cloth (paper towels can scratch) and gently wipe it off.
I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the ammonia will crack and distort polycarbonate plastics.
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