Service Diagnosis - Scotsman ACM 85 Service Manual

SERVICE DIAGNOSIS

SYMPTOM
Unit will not run
(No warning LEDS glows)
(Green LED-Power ON glows)
(Bin full LED glows)
(Red-alarm LED glows)
(Red-alarm LED blinks)
Compressor cycles intermittently
Cubes too small
Cloudy cubes
POSSIBLE CAUSE
Blown power in fuse in P.C.Board
Main switch in OFF position
Inoperative P.C.Board
Loose electrical connections
P.C.Board selector in STAND BY
Blown power out fuse in P.C. Board
Inoperative ice level control
Inoperative P.C.Board
High head pressure
High evaporating temperature
after 10 mins. beginning freeze
Low voltage
Contactor with burnt contacts
Non-condensable gas in system
Compressor starting device with
loose wires
Mechanical problem
Freezing cycle too short
Capillary tube partially restricted
Moisture in the system
Shortage of water
Shortage of refrigerant
Inoperative evaporator sensor
Shortage of water
Dirty water supply
Accumulated impurities
Spray bar not rotating (AC 225)
or slowly rotating
SUGGESTED CORRECTION
Replace fuse & check for cause of
blown fuse
Turn switch to ON position
Replace P.C.Board
Check wiring
Move to OPERATING position
Replace fuse & check for cause of
blown fuse
Clean or replace ice level control
Replace P.C.Board
Dirty condenser. Clean
Inoperative fan motor. Replace
Shortage of water (WC)
Hot gas valve leak - Replace it.
Water inlet valve leak - Replace it.
Evap. sensor inoperative - Replace it.
Short of refrigerant.
Check circuit for overloading
Check voltage at the supply to the
building. If low, contact the power
company
Clean or replace
Purge the system
Check for loose wires in starting
device
Replace compressor
Review setting of DIP SWITCH keys
Blow charge, add new gas & drier,
after evacuating systemwithvacuum
pump
Same as above
See remedies for shortage of water
Check for leaks & recharge
Replace sensor
See remedies for shortage of water
Use water softner or water filter
Use SCOTSMAN Ice Machine
cleaner
Remove spray bar & jet bearing
and clean or replace them
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