Your model has something called an
Auto Damper between freezer and fresh food compartment. Click here for a
photo=> MZD2768GES Controls part
listed as number 8 in that photo part=> 61005991 Damper Control Assembly and your ADC adaptive defrost control=>61005971Adaptive Defrost Control
and that is part 13 in the photo above inside the control panel in fresh food
compartment. Either of one of those fail and ice will build up behind freezer
wall to the point of either no defrost to erratic defrost. Here is a link here
that shows a short movie of what no defrost causes=> HERE. I have the service
manual but am no longer to post it here because now Whirlpool owns Maytag and
they have become very strict about publishing on-line yet I do communicate with
Whirlpool and can assist you one on one through contacting me here or my web
site. Sounds like you have a defrost drain blockage also but that will be no
problem once we find the root cause. Is the rear wall of freezer showing a
frost line building up? Please feel free to contact me and I will be glad to
assist you and if it is something I cannot post here I can assist you through
Whirlpool, Thanks, Sea Breeze
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