If it's the child lock function you need to press the stop/reset button 3 times.
Click here for the user manual
I've included a link to the user manual for you.
Hope this helps
THANKS FOR YOUR HELP. Do have a manual for the NNT-573S ?
The link gives you the manual for the NN-S563/T563.
The same manual is used for the NN-S563 and the NN-T563
Our microwave is a NN-T573s Inverter not the NN-T563 so the manual is different.
OK, thanks for that.
I'm having a senior moment I think.
I've read 573 as 563 evertime I've looked at this question. Sorry.
Hope this is the one.