KM1301SAH-E Service Manual - Hoshizaki

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.
3. Cube Guide a) Out of position.
4. Spray Tubes and/or Spray a) Dirty.
Guides
b) Out of position.
5. Refrigerant Charge a) Low.
6. Ambient Temperature a) Too cool.
7. Water Supply a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID (10 mm nominal OD)
8. Thermostatic Bin Control a) Extension bracket not installed.
See "IV.C.1. Thermostatic Bin b) Bulb out of position.
Control Check."
c) Bad contacts.
9. Control Board
a) Harvest timer set too short.
See "IV.B. Control Board Check." b) Defective.
10. Mechanical Bin Control a) Actuator does not move freely.
See "IV.C.2. Mechanical Bin
Control Check and Cleaning."
11. Thermistor
a) Loose, disconnected, or defective.
See "IV.E. Thermistor Check."
12. Hot Gas Valve a) Closed.
13. Inlet Water Valve a) Water valve screen clogged.
14. Liquid Line Valve (if applicable) a) Open.
15. Expansion Valve (TXV) a) Defective.
16. Water Regulating Valve a) Leaking by.
(water-cooled model)
b) Defective.
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