Ice maker quit

Turned off water, unplugged refrigerator, Removed defective unit with support bracket. Installed support bracket, adjusted flow screw per instructions, plugged in wiring with adapter, hung on screws, tighened screws, secured excess wiring harness (making sure it did not hang below icemaker per instuctions), turned on water, plugged in refrigerator. Comment it took a few hours to start making ice, air in line? After a couple of days seems to be working fine.