Service Diagnosis - Scotsman AF Series Service Manual

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SERVICE DIAGNOSIS

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