Service Manual

37
Freeze-Up - Possible Cause
8. Control Board
See "II.D. Control Board
Check" and "III.D. Settings and
Adjustments"
a) Harvest timer (S4 dip switch 1 & 2) set too short.
b) Harvest pump time (harvest assist) (S4 dip switch 7) not in factory
default position.
c) Defective.
9. Bin Control
See "II.E. Bin Control Check"
a) Actuator does not move or defective.
10. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
11. Thermostatic Expansion Valve a) Defective.
12. Hot Gas Valve a) Closed or restricted.
13. Liquid Line Valve a) Open.
Freeze Cycle
1. Evaporator a) Scaled up.
b) Damaged.
2. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
3. Refrigerant Charge a) Low.
4. Control Board
See "II.D. Control Board Check"
a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.
b) Defective.
5. Inlet Water Valve a) Leaking by.
6. Float Switch
See "II.F. Float Switch Check and
Cleaning"
a) Float does not move freely.
b) Defective.
7. Pump Motor a) RPM too slow.
b) Impeller damaged.
8. Thermostatic Expansion Valve a) Bulb loose or defective.
9. Liquid Line Valve a) Restricted.
10. Headmaster (C.P.R.)
(remote models)
a) Not bypassing.