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UGT Series Manual
Temperature Options Without a Temperature Controller
The default temperature setting for this appliance installed without a temperature controller is 120° F (49° C). If
desired, the temperature setting can be changed to 140° F (60° C) by adjustment of a switch.
In the SW1 Dip switch (tan switches), set switch 5 to ON to obtain 140° F water temperature setting. Set switch
5 to OFF (default) to obtain 120° F water temperature setting. If a temperature controller is installed, then
switch 5 has no effect on temperature settings.
Setting Controller to Mute
On the MC-91-2 to eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both
the up and down buttons until a beep is heard (approximately 5 seconds).
Locking the Controller
The MC-91-2 controller can be locked by pressing the Priority button and the up button together for 5 seconds.
A beep will sound confirming that the controller is locked. The display will alternately show “LOC”, the
temperature setting, and a diagnostic code if one has been activated. All of the controllers in the system are
also locked.
To unlock the controller press the Priority button and the up button together for 5 seconds.
To Display Diagnostic Information
To display the most recent diagnostic information codes press and hold the “On/Off” button for 2 seconds on
the MC-91-2 controller. While holding the “On/Off” button press the up button. The last 9 diagnostic codes will
flash one after the other. To exit this mode press the “On/Off” and up button as before.
To enter or exit the maintenance monitor information mode press and hold the down button for 2 seconds and
without releasing it press the ON/OFF button.
To obtain the water flow rate press the up or down buttons until “01” displays. The water flow rate will then
appear. For example “58” means 5.8 gal/min.
To obtain the outgoing water temperature press the up or down buttons until “02” displays. The temperature
will appear in degrees Fahrenheit.
Diagnostic Codes
This water heater is designed to display diagnostic codes. If there is a potential operation concern refer to the
code and remedy on the next page.
Data
Unit
No.
Water flow rate
0.1 gal/min
01
Outgoing water temperature
Degrees Fahrenheit
02
