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2. Checking or Changing the Control Board Model Code
1) With unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes to
"n1".
2) Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list until "h6" is
displayed.
3) Press the "RESET" button to view the current model code. To change the model code,
continue through the remaining steps; otherwise, the display returns to normal if no
buttons are touched for 20 sec.
4) Press and hold the "SERVICE 1" and "SERVICE 2" buttons simultaneously for 15 sec.
"00" appears in display.
5) Press the "SERVICE 1" button to increase the first digit in the display and the
"SERVICE 2" button to increase the second digit. Digits appear in the following order:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. When a valid model code is displayed, the dot
in the bottom right of the display turns on. For IM-500SAB, set model code to "08".
6) When the desired model code is displayed, press the "RESET" button to save the
setting. "on" appears in the display.
F. Error Codes
When the control board detects an error, the display shows one of the following error
codes in the display mode. Error codes other than E1 and E2 are displayed as "EE" at
the time of occurrence. To see the actual error code, see the error log.
1) With the unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes
to "n1".
2) Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list until "h4" is
displayed.
3) Press the "RESET" button to view the error log. Displays up to 5 errors with the most
recent error first.
4) Press the "RESET" button to return to list. To clear error log history, press and hold the
"SERVICE 1" and "SERVICE 2" buttons simultaneously for 5 sec.
5) Display returns to normal if no buttons are touched for 20 sec.
Error Codes
Error
Code
Problem
Corrective Action/Reset Details
E1
Freeze Cycle Backup Timer
Freeze cycle backup timer (Control Board Setting
6) has terminated.
45 min. after water tank starts to close in preced-
ing harvest cycle, unit stops if the evaporator
temperature is above 32°F (0°C).
Check for inlet water valve leaking by, hot gas valve
leaking by, pump motor not pumping, thermostatic
expansion valve not feeding properly, low charge, or
inefficient compressor.
Press the "RESET" button to reset.
E2
Harvest Cycle Backup Timer
Harvest cycle backup timer has terminated.
30 min. after water tank starts to open in harvest
cycle, unit stops if harvest cycle termination tem-
perature (Control Board Setting 1) has not been
reached.
Check for open thermistor, HGV not opening, TXV
leaking by, low charge, or inefficient compressor.
Press the "RESET" button to reset.
