Hello, Thank you for using this service, I will be helping you with your problem today
can you get us the model number from the inside on the tag on the side wall ?
Thats not a good sign, theres no reset in these the problem is the smart board has failed. if you tried unplugging this and it doesn't reset the board would need to be replaced to fix the issue. the board is around $126.00. its located behind the key pad in the control panel. theres a link below to order this is you wish.
control board--- http://www.repairclinic.com/PartDetail/Main-Control-Board/5304468192/1485555?modelNumber=PLMV169DCD sorry theres no easy fix for this, well wishes and thanks, Bryan