Hoshizaki 73180 ユーザーズマニュアル

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9. Refrigerant 

a) Low charge or overcharged.
b) Refrigerant lines or components restricted. 

10. Water System

a) Water leaks.

1. Bin Control Thermostat Assembly 

(with integrated heater)

a) Out of position.
b) Out of adjustment. See "IV.C. Bin Control Check."