Hoshizaki DCM-271BAH-OS Service Manual page 27

No Ice Production - Possible Cause
1. Control Board
See "II.C. Control Board Check"
2. Gear Motor
3. Coupling
4. Compressor Control Relay
1. Control Board
See "II.C. Control Board Check"
2. Start Relay
3. Start Capacitor
4. Compressor
5. High-Pressure Switch Activates
6. Fan Motor
7. Evaporator
8. Thermostatic Expansion Valve
(TXV)
9. Refrigerant Charge
10. Drain Valve
11. Water System
Ice Purge Cycle
a) No power to gear motor.
a) 3A external protector tripped.
b) Internal protector open.
c) Motor winding.
d) Mechanical failure.
a) Defective.
a) Defective.
Freeze Cycle
a) No power to compressor control relay circuit (5VDC) or not
reading circuit.
b) Compressor relay defective
a) Defective.
a) Defective.
a) External protector.
b) Motor winding.
c) Mechanical failure.
a) Dirty condenser.
b) Ambient temperature too warm.
c) Fan motor not operating.
d) Refrigerant overcharged.
e) Defective.
f) Refrigerant lines or components restricted.
a) Capacitor defective.
b) Motor winding.
c) Bearing worn out or locked rotor.
a) Dirty.
b) Damaged or defective.
a) Bulb loose.
b) Operating erratically.
a) Low.
a) Dirty, leaking by.
b) Defective coil.
c) Defective control board.
a) Water leaks.
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