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Servicing should only be performed by a Qualied Service Agent
CONTROL OVERVIEW
Interaction with the water heater controller is through an LCD display called the Universal Interface
Module (UIM). This screen is also referred to as the “desktop” or “desktop menu”. Up and down buttons
and three operation buttons allow navigation through the control menus and to make adjustments to the
water heater. Operation of the three lower buttons is defined immediately above them on the screen.
While the water heater is operating, the user interface will display the desktop screen (if there are no active
faults or warnings).
An example of this screen is shown below.
• The first temperature on this screen is the temperature of the water inside the tank.
• The second temperature on this screen is the Operating Set Point.
• The Operating Set Point is the temperature at which the water heater will maintain the water inside the
tank.
• The third line on the screen is a text description of the Operational State of the water heater. The
operating state of the water heater is also indicated graphically by status icons.