Low Ice Production - Hoshizaki KM-320MAH Service Manual

Freeze-Up - Possible Cause
11. Thermostatic Expansion Valve
12. Hot Gas Valve
13. Liquid Line Valve
1. Evaporator
2. Spray Tubes and/or Spray
Guides
3. Refrigerant Charge
4. Control Board
See "II.C. Control Board Check"
5. Inlet Water Valve
6. Float Switch
See "II.E. Float Switch Check
and Cleaning"
7. Pump Motor
8. Thermostatic Expansion Valve
9. Liquid Line Valve
10. Headmaster (C.P.R.)
(remote models)

3. Low Ice Production

Low Ice Production - Possible Cause
1. Evaporator
2. Spray Tubes and/or Spray
Guides
3. Refrigerant Charge
4. Water Supply
5. Control Board
See "II.C. Control Board Check"
6. Thermistor
See "II.F. Thermistor Check"
7. Hot Gas Valve
8. Inlet Water Valve
9. Compressor
10. Liquid Line Valve
11. Thermostatic Expansion Valve
a) Defective.
a) Closed or restricted.
a) Open.
Freeze Cycle
a) Scaled up.
b) Damaged.
a) Dirty.
b) Out of position.
a) Low.
a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.
b) Defective.
a) Leaking by.
a) Float does not move freely.
b) Defective.
a) RPM too slow.
b) Impeller damaged.
a) Bulb loose or defective.
a) Restricted.
a) Not bypassing.
Long Harvest Cycle
a) Scaled up.
a) Dirty.
b) Out of position.
a) Low.
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.
a) Thermistor connection loose (K3).
b) Defective.
a) Loose, disconnected, or defective.
a) Erratic or closed.
a) Screen or orifice clogged.
a) Inefficient or off.
a) Erratic or open.
a) Defective.
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