OK Thank you the WW has no space before it .
This model does not have a RESET button ,
It has An Electronic control in the rear of the unit .
To advance it into defrost unplug the unit for 30 seconds and then plug it back in .
Yes that is how you advance it into defrost and just unplug it for 30 sec.
then it Should go into defrost to melt the coils
no that is the defrost thermostat if it is bad it will not go into defrost .
you will need to defrost it by hand.