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(3) High Temperature Safety - 127 ± 7°F
The temperature of the suction line in the refrigerant circuit is limited by the high temperature
safety. During the defrost cycle the evaporator temperature rises. The thermistor senses 48°F
and starts the defrost timer. After the defrost timer counts down to zero, the normal freeze cycle
begins. If the evaporator temperature continues to rise, the thermistor will sense the rise in
temperature and at 127 ± 7°F the thermistor operates the high temperature safety. This high
temperature safety shuts down the circuit and the icemaker automatically stops. To reset the
safety, turn the power off and back on again. This high temperature safety protects the unit from
excessive temperature. The control board will beep every three seconds. The white reset button
on the control board must be pressed with power on to reset the safety.
(4) Low Water Safety
If the pump motor is operated without water, the mechanical seal can fail. To prevent this type of
failure, the controller board checks the position of the float switch at the end of the initial one
minute water fill cycle and at the end of each defrost cycle.
If the float switch is in the up position (electrical circuit closed), the controller board changes to
the ice making cycle. If the float switch is in the down position (electrical circuit open), the
controller board changes to a one minute water fill cycle before starting the ice making cycle.
This method allows for a low water safety shut down to protect the water pump from mechanical
seal failure. For water-cooled models, if the water is shut off, the unit is protected by the high
pressure switch.
(5) High Voltage Cut-out
The maximum allowable supply voltage of this icemaker is limited by the high voltage cut-out. If
miswiring (especially on single-phase, 3-wire models) causes excessive voltage on the
controller board, the high voltage cut-out shuts down the circuit in 3 seconds and the icemaker
automatically stops. When the proper supply voltage is resumed, the icemaker automatically
starts running again. The control board will signal this problem using 7 beeps every 3 seconds.
6) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup a 5 second delay occurs while the board conducts an internal timer
check. A short beep occurs when the power switch is turned ON or OFF.