Whirlpool Refrigerator Model No. WRN28RWG6

Question

Dear Noggin,

I have a 2 door refrigerator model as above and it intermittently freezes (non frozen goods) food in the lower compartment. I suspect it might be the control unit box situated on the back wall of the lower compartment which sometimes ices up the air-flow flap. Would this possibly cause excessive cold air coming from the freezer down into the lower compartment, as the flap is jammed open due to the ice. Does this mean that the control unit box needs to be replaced. Hoping you can help.

Thanking You
Mick