Controller Details - Scotsman UF424A-1A Technical Manual

UF424 / UN324 Technical Manual

Controller Details

The controller has features for the service technician. Some details:
• Any auger motor failure is an immediate shut down. Because of the critical nature of that failure there is no
auto restart from an auger error.
• An open Water Sensor (dry probes) will stop the machine. Because water can be restored at any time,
whenever both Water Sensor probes are wet again AND the compressor has been off for at least two minutes,
ice making will restart.
• An open High Pressure switch will stop the machine. Because the pressure switch is an automatic reset,
when it closes AND the compressor has been off for at least two minutes, ice making will restart.
• Fault Code View: Push and HOLD the clean button (auger motor starts) AND then push and release the
on/off button 3 times (auger motor stops) or until Status light is on. Release both. Pushing Clean will cycle
thru the available codes, the total number of codes stored is 30.
Note: An existing error cause will not allow the fault codes to be read. Example: No water in the reservoir will
trigger an immediate code 3 and any other codes cannot be read. Either correct the cause or jump out the
sensor signaling the error and then go thru the Fault Codes View process.
• Clear codes: Only from Fault Code View: Push and HOLD the Clean button for about 3 seconds. The
display code will blink 3 times. Release.
• The compressor will not restart until it has been off for at least 2 minutes.
• There is a Test Mode. The Test Mode operates each load in sequence to confirm that it is being powered
by the controller.
To start Test Mode: Push and HOLD the ON/OFF button; at the same time, push and HOLD the CLEAN button.
When a "d" appears in the code display, release the buttons, the test mode will begin.
Time (seconds) On
0 Compressor
10 Compressor and Auger Gear Motor
20 Auger Gear Motor
20 None
40 None
• The Time to Clean indicator light glows when 6 months of power up time have elapsed. When it is on it
does NOT stop ice making. It is cleared and reset when the Cleaning process has been completed.
• The Cleaning process, described in detail in the Maintenance section, is initiated by a press of the Clean
button. The auger motor will be operating during the entire Clean mode, the compressor starts automatically
to make ice with the scale remover solution. The scale is dissolved by the action of the scale remover solution
and the auger's motion.
• USB firmware updates may become available. To update the unit must be in Test Mode and then a USB
stick with ONLY the update on it is inserted into the USB connector. L will be displayed during the Loading
process. After a few seconds the LEDs begin scrolling up for about 75 seconds then the LEDs start scrolling
down for about 20 seconds. At the end "0" is displayed. Unplug the USB drive.
Note: If during the update process the display flashes between "L" and "F" that means that the Load Failed. If
that happens, unplug the USB drive, then power cycle the control board. If "0" is not displayed, press the On/
Off button. The controller will revert to the original firmware.
Off
Auger Gear Motor
Compressor
Auger Gear Motor, Compressor
All – Test Complete
September 2017
Page 17