Service Diagnosis: Condition - No Ice Being Produced - Scotsman AFE424A-1 Service Manual

AFE424

Service Diagnosis: Condition - No Ice Being Produced

STATUS: ICE MAKER DOES NOT OPERATE
A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. If the voltage is
correct and the unit will not start, go to B.
B. Check: The master switch, switch ON if off. If the unit does not start go to C.
C. Check: The reset switch, (high pressure): on water cooled models depress and release the high
pressure reset switch. If the unit still does not start, go to D.
The pressure control opens at 250 PSIG (+ or - 30). Normal operation: water cooled - water will flow
from the condenser drain; air cooled - the fan blade turns and pulls hot air out of the machine. On water
cooled, if the water supply was turned off, the unit will possibly trip on high pressure.
If the unit trips out on pressures below 220 PSIG, replace the control.
Air cooled models have an automatic reset control. if it does not reset, check the discharge pressure. The
control opens at 260 and re-closes at 190.
D. Check that the bin thermostat is closed. If open with no ice on it, turn thermostat knob CCW, if this
does not close the thermostat, replace it. If the thermostat is closed and the unit will not start, go to E.
E. Check the water pressure to the unit. The machine will not run if there is not enough water
pressure. Restore/adjust water supply. If the unit will not start with good water pressure, go to F.
F. Check that the Auger Delay contacts 3-2 are closed. If open, and the low side (suction) pressure is
over 35 PSIG, replace the auger delay pressure control. If contacts 3-2 are closed, and the unit will not
start, go to G.
G. Check: The gear motor, if it will not run, the compressor will not run. If there is power to the auger
drive motor, and it does not run, replace the auger drive motor. If the motor operates, but the
compressor will not start, go to H. Note: The gearmotor may not go to full speed if the evaporator
bearings are worn or the evaporator needs cleaning.
H. If the gearmotor operates, but the compressor contactor coil does not have power, check the
centrifugal switch. If the contactor coil does have power but does not pull in, replace the contactor. If
all of the above check out, there will be power to the compressor.
April 2010
Page 16