Hoshizaki KM-1601SAH/3 - Manual (Page 65)

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2. Freeze Up
Defrost and clean the unit prior to diagnosing freeze up. See "VI.A. Cleaning and Sanitizing
Instructions."
Freeze Up - Possible Cause
Harvest Cycle
1. Evaporator a) Scaled up.
b) Damaged.
2. Separators a) Out of position.
b) Damaged.
3. Cube Guide a) Out of position.
b) Damaged.
4. Inlet Water Valve a) Water valve screen clogged.
b) Defective.
5. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
6. Refrigerant Charge a) Low.
7. Ambient Temperature a) Too cool.
8. Water Supply a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID copper water tubing or equivalent.
9. Thermostatic Bin Control
See "IV.C. Bin Control Check."
a) Extension bracket not installed.
b) Bulb out of position.
c) Bad contacts.
10. Control Board
See "IV.B. Control Board Check."
a) Harvest timer set too short.
b) Defective.
11. Thermistor
See "IV.E. Thermistor Check."
a) Loose, disconnected, or defective.
12. Hot Gas Valve a) Closed.
13. Liquid Line Valve (if applicable) a) Open.
14. Thermostatic Expansion Valve
(TXV)
a) Defective.
15. Water Regulating Valve
(water-cooled model)
a) Leaking by.
b) Defective.
Freeze Cycle
1. Evaporator a) Scaled up.
b) Damaged.
2. Separators a) Out of position.
b) Damaged.
3. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
4. Refrigerant charge. a) Low.
5. Check Valve a) Defective.
6. Control Board
See "IV.B. Control Board Check."
a) Freeze timer set incorrectly.
b) Defective.