if the ice that coated the freezer looked like it may have come from the icemaker fill tube then its probably the water valve that needs replaced but this would just be a semi-educated guess - is the fill tube to the icemaker frozen inside with ice? if so thats a good indication your water valve is bad. now if it was the back wall of the freezer that was coated with ice you could possibly have a defrost problem which would restrict airflow in the freezer and fridge which could cause the icemaker to stop working because the freezer temp would be a little warmer due to the restricted airflow..