KM-650MAH-E Service manual - Hoshizaki

3. Low Ice Production
Low Ice Production - Possible Cause
Long Harvest Cycle
1. Evaporator a) Scaled up.
2. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
3. Refrigerant Charge a) Low.
4. Water Supply a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) water
tubing or equivalent.
d) Too cold.
5. Control Board
See "IV.B. Control Board Check"
a) Thermistor connection loose (K3).
b) Defective.
6. Thermistor
a) Loose, disconnected, or defective.
See "IV.E. Thermistor Check"
7. Hot Gas Valve a) Erratic or closed.
8. Inlet Water Valve a) Screen or orifice clogged.
9. Compressor a) Inefficient or off.
10. Liquid Line Valve
a) Erratic or open.
(KM-515MAH-E)
11. Thermostatic Expansion Valve a) Defective.
Long Freeze Cycle
1. Evaporator a) Scaled up, dirty.
2. Float Switch
a) Scaled up, dirty.
See "IV.D. Float Switch Check b) Float sticking.
and Cleaning"
c) Defective switch.
3. Inlet Water Valve a) Leaking by.
4. Hot Gas Valve a) Erratic or open.
5. Condenser a) Clogged.
6. Control Board
See "IV.B. Control Board Check"
a) Float switch connection loose (K5).
b) Defective.
7. Refrigerant Charge a) Low.
8. Thermostatic Expansion Valve a) Bulb loose.
b) Defective.
9. Compressor a) Inefficient or off.
10. Pump Motor a) RPM too slow.
11. Liquid Line Valve
a) Erratic or restricted.
(KM-515MAH-E)
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