Owners Manual

Ice machine operational and diagnostic sequences
The wiring diagrams that follow illustrate the circuitry of Follett ice machines used with 12 series ice dispensers.
Both normal operation (stages 1–8) and non-normal diagnostic sequences showing torque-out for use in
troubleshooting are shown.
Circuitry notes
§ Bin signal is contact closure only - DO NOT SUPPLY POWER.
Note: The operation stage descriptions that follow are based on the unit containing the split-phase gear
motor.
Normal operation – Stage 1
Power is supplied to L1 of the control board, the POWER LED light begins ashing. The ice level bin thermostat in
the dispenser is closed and calling for ice, supplying contact closure to the control board. The LOW BIN LED will
be on. The control board will now go through the start-up sequence. The board checks the water sensors (located
in the reservoir) for continuity between the common probe (B) and the high probe (C). If continuity is not sensed,
the water ll valve (P21) is energized.
Compressor
MAINTENANCE
LOW WATER
TIME DELAY
SLEEP CYCLE
MAKING ICE
LOW BIN
POWER
SERVICE
HI AMPS
HI PRESSURE
CLEANER FULL
Gearmotor
Water Sensors
Clean Switch
High
Pressure
Switch
Start
Relay
OR
Capacitor
BLACK
YELLOW
NO CONNECT
24 12CI425A, 12HI425A