Product review (5 stars): Simple but effective fix
This Whirlpool Heat Probe cured my long standing Ice Buildup problem in the freezer floor.  It is a Kenmore side-by-side. The Heat Probe is Easy to install.  I even took a short cut to install it by not removing any shelf just the bottom wire basket then bending up the back sheet metal guard and bending it back down after the install.  You never see it anyway.  It has been three months and still no ice buildup.  How fortunate to finally find out that it exist.