Service manual

Page 34
Page 34
SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Unit will not run Blown fuse in P.C.Board Replace fuse & check for cause of
No LED lighted-up blown fuse
Master switch in OFF position Turn switch to ON position
Inoperative P.C.Board Replace P.C.Board
Loose electrical connections Check wiring
Bin full yellow LED glows with Inoperative or dirty ice level control Replace or clean ice level control
no ice in the bin
Water yellow LED glows Shortage or too soft water See remedies for shortage of water
or install a mineral salt metering
device
Red-alarm LED glows High head pressure Dirty condenser. Clean
Inoperative fan motor. Replace
Ambient temperature too low Move unit in warmer location
Reverse rotation yellow LED blinks Too hi evap. temperature Check and charge refrigerant system
Shortage or lack of refrigerant
Reverse rotation yellow LED glows Gear motor turns on reverse Check gear motor capacitor
Too low gear motor rotating speed Check rotor bearings, freezer
bearings and interior of freezer for
scores. Replace whatever worn or
damaged.
No rotation of gear motor Check for power to drive motor
(16 A fuses)
Check for stator winding
Gear motor starts and stop Check for correct operation of drive
after a while motor magnetic sensor
Check for correct magnetic capacity
of magnetic cylinder
Water yellow LED and red LED Inoperative Condenser Sensor Replace it.
ON (steady) together
Water yellow LED and red LED Inoperative Evaporator Sensor Replace it.
blink together
Compressor cycles intermittently Low voltage Check circuit for overloading
Check voltage at the supply to the
building. If low, contact the power
company
Non-condensable gas in system Purge the system
Compressor starting device with Check for loose wires in starting
loose wires device
Low ice production Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with vacuum
pump
Moisture in the system Same as above
Low water level in the freezer Adjust to approx 20 mm below ice
spout
Shortage of refrigerant Check for leaks & recharge
Pitted or stained auger surface Clean or replace auger
SERVICE DIAGNOSIS