Service manual

Page 36
Page 36
SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Irregular cubes size & some Some jets plugged Remove spray bar & jet bearing
cloudy and clean them
Shortage of water See shortage of water
Unit not level Level as required
Spray bar not rotating Remove spray bar & jet bearing
and clean them
Cubes too large Freezing cycle too long
Review setting of DIP SWITCH keys
Inoperative evaporator sensor Replace sensor
Decreased ice capacity Inefficient compressor Replace
Leaky water valve Repair or replace
Non-condensable gas in system Purge the system
Poor air circulation or excessive Relocate the unit or provide for
hot location (Red-alarm LED glows ) more ventilation
Overcharge of refrigerant
Correct the charge. Purge off slowly
Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with
vacuum pump
Hot gas solenoid valve leaking Replace valve
Short of refrigerant Charge to data plate indication
Discharge head pressure too high See incorrect discharge pressure
Poor harvest Restriction in incoming water line
Check water valve strainer and flow
control. If necessary enlarge the
flow control orifice
Water inlet valve not opening Valve coil with open winding
Replace valve
Hot gas valve orifice restricted Replace hot gas valve assy
Clogged air vented holes in mold cups Clean out holes plugged
Discharge head pressure too low See incorrect discharge pressure
Unit won’t harvest Inoperative P.C.Board Replace P.C.Board
Hot gas valve not opening Valve coil with open winding
Replace valve
Water solenoid valve not opening Valve coil with open winding
Replace valve
Incorrect discharge pressure Inoperative condenser sensor Replace sensor
Inoperative P.C.Board Replace P.C.Board
Water regulating valve misadjusted Adjust its setting stem
Excessive water in unit base Water tubing leaking Check. Tighten or replace
SERVICE DIAGNOSIS