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Electronic Control
Service Diagnostic Mode
Initiate Service Mode
The refrigerator and freezer controls have individual service modes. Each control assembly has a thermistor
embedded on the electronic control assembly circuit board.
To initiate service mode for the refrigerator or freezer control, set the control to “4” then press and hold the UP and
DOWN buttons for 3 seconds until the display changes to "8".
When the diagnostics mode is entered, the number "8" is displayed for three seconds indicating diagnostic mode.
After three seconds the numbered information below will be displayed in 3 second intervals and then the system will
then exit the diagnostic mode, automatically assuming the default temperature setting.
Changing the model number will cause the control to operate within parameters defined for other models.
1. “8” (7 segment display test)
2. Model ID (1)
3. SW Version (0)
4. Thermistor status
"C" for short
"O" for open
"-" for good thermistor
Defrost Cycle Timing
After each 12 hours of accumulated compressor runtime, a defrost cycle will be entered and last for thirty minutes.
The heater will be active until the defrost thermostat opens at 47° F, turning off the defrost heater. The defrost
thermostat closes at 37° F.
Manual Defrost Mode
When pressing both UP and DOWN keys for 3 seconds while on setting "2", the control will enter Manual defrost
mode. The display will show a "d". Manual defrost can be cancelled by again holding both UP and DOWN keys for
3 seconds. Manual defrost mode will terminate after the defrost cycle has completed. The control will resume normal
operation on setting "2".
Compressor Delay Start
When the compressor is turned off it will not start again for 13 minutes.
Voltage Range
The control operates normally down to a line voltage of 92 volts. Below this voltage, the compressor is turned off
and an "E" will flash for one second intervals on the display of the active electronic control assembly. A low voltage
check should be done at the power supply outlet. The unit must have a minimum of 92 volts to operate.
Once the voltage rises above 92 volts, the control resumes normal operation.