Hoshizaki KM-900MAF, Service Manual

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PROBLEM POSSIBLE CAUSE REMEDY
[4] Water a) Water Solenoid 1. Diaphragm does not close. 1. Check for water leaks
continues to Valve with icemaker off.
be supplied in b) Controller Board 1. Defective. 1. See “II.2.[e] CHECKING
freeze cycle. CONTROLLER BOARD.”
[5] No water a) Water Supply Line 1. Water pressure too low and 1. Check and get
comes from water level in Water Tank recommended pressure.
Spray Tubes. too low.
Water Pump b) Water Solenoid 1. Dirty mesh filter or orifice 1. Clean.
will not start, or Valve and water level in Water
freeze cycle Tank too low.
time is too c) Water System 1. Water leaks. 1. Check connections for
short. water leaks, and replace.
2. Clogged. 2. Clean.
d) Pump Motor 1. Motor winding opened. 1. Replace.
2. Bearing worn out. 2. Replace.
3. Wiring to Pump Motor. 3. Check for loose
connection or open, and
replace.
4. Defective Capacitor. 4. Replace.
5. Defective or bound impeller. 5. Replace and clean.
6. Mechanical Seal worn out.
6. Check and replace.
e) Controller Board 1. Defective. 1. See “II.2. [e] CHECKING
CONTROLLER BOARD.”
[6] Fan Motor will a) Fan Motor 1. Motor winding opened. 1. Replace.
not start, or is 2. Bearing worn out. 2. Replace.
not operating. 3. Wiring to Fan Motor. 3. Check for loose
connection or open, and
replace.
4. Defective Capacitor. 4. Replace
5. Fan blade bound. 5. Check and replace.
b) Controller Board 1. Defective. 1. See “II.2. [e] CHECKING
CONTROLLER BOARD.”
[7] All components a) Refrigerant 1. Undercharged. 1. Check for leaks and
run but no ice recharge.
is produced. 2. Air or moisture trapped. 2. Replace Drier, and
recharge.
b) Compressor 1. Defective valve. 1. Replace.
c) Hot Gas Solenoid 1. Continues to open in freeze 1. Check and replace.
Valve cycle.
d) Line Valve 1. Continues to close in 1. Check and replace
freeze cycle.
e) Water Supply Line 1. Condenser water pressure 1. Check and get
[Water-cooled model too low or off and Pressure recommended pressure.
only] Control opens and closes
frequently.