LG PRCKD42E Owner's Manual page 70

SYSTEM SETTINGS
70
5) Set the lowest value for cold/hot water valves
The minimum required value for linking valve control is different by site, so the minimum
value for the cold/hot water valves can be set separately.
It can be set between 0 and 100% in the ComboBox below.
Click the button to set the minimum value for the cold/hot water valves.