DONPER USA—USER MANUAL
29 — COPYRIGHT DONPER USA 2015
Problem
1. High pressure switch has been activated.
Solution
1. If the high pressure switch is activated, the unit will beep and
display “HH” on the LCD screen. This is caused by high pres-
sure being detected at high pressure side of the main compres-
sor refrigeration system.
Possible causes:
High ambient temperature
Poor cooling from the condenser
Poor air circulation around the machine
Faulty main condenser fan
Dirty condenser coils
Contact an authorized commercial refrigeration technician to
inspect the refrigeration system.
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