Unit was off on full bin when I arrived. I lowered ice level so machine would run and checked operation. Freeze and harvest times seemed normal. I called Manitowoc and and they said my head pressure was a little low. Found head master not maintaining correct pressure (should be 225 psi but was 205 psi) Will get headmaster and return 12/22/16 Recovered refrigerant and replaced head master and filter drier. When I started unit up I noticed head pressure was off. I called Manitowoc and they said I received the wrong valve. Will re order 12/23/16 Recovered refrigerant and replaced head master and filter drier. Pulled vacuum on system and put refrigerant back in. Head pressure now looks good and unit is working properly