GB
27
SERVICE DIAGNOSIS
SYMPTOM
POSSIBLE CAUSE
SUGGESTED CORRECTION
Irregular cubes
size & some cloudy
Cubes too large
Decreased ice capacity
Poor harvest
Incorrect discharge pressure
Excessive water in unit base
Some jets plugged
Shortage of water
Unit not level
Freezing cycle too long
Inoperative evaporator thermostat
Inefficient compressor
Leaky water valve
Non-condensable gas in system
Poor air circulation or excessive
hot location
(Red-alarm LED glows)
Overcharge of refrigerant
Capillary tube partially restricted
Hot gas solenoid valve leaking
Undercharge of refrigerant
Discharge head pressure too high
Restriction incoming water line
Water inlet valve not opening
Hot gas valve orifice restricted
Discharge head pressure too low
Inoperative fan pressure control
Inoperative fan motor
Water regulating valve misadjusted
Water tubing leaking
Remove jet cover and clean
See shortage of water
Level as required
Adjust evap. thermostat
Replace thermosta
Replace
Repair or replace
Purge the system
Relocate yhe unit or provide for
more ventilation
Correct the charge. Purge off slowly
Blow charge, add new gas & drier,
after evacuating system with
vascuu pump
Replace valve
Charge to data plate indication
See incorrect discharge pressure
Check water valve striner and flow
control. If necessary enlarge the flow
control orifice
Valve coil with open winding
Replace valve
Replace hot gas valve assy
See incorrect discharge pressure
Replace pressostat
Replace
Adjust its setting stem
Check. Tighten or replace
Summary of Contents for N21
Page 16: ...GB 30 ELECTRIC DIAGRAM N21...
