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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 flashing. 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 fill valve (P21) is energized.
Start
Relay
Capacitor
OR
Water Sensors
24
12CI425A, 12HI425A
Compressor
Gearmotor
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
CLEANER FULL
Clean Switch
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