Service Diagnosis - Scotsman MC 15 Service Manual

Page 35

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)
(Freezing LED + Red-alarm LED glow)
(Freezing LED + Red-alarm LED blink)
Compressor cycles intermittently
Cubes too small
Cloudy cubes
Shortage of water
POSSIBLE CAUSE
Blown power in fuse in P.C.Board
Main switch in OFF position
Inoperative P.C.Board
Loose electrical connections
Blown power out fuse in P.C. Board
Inoperative ice level control
Inoperative P.C.Board
High head pressure
High evaporating temperature
after 15 mins. beginning freeze
Condenser sensor out of order
Evaporator sensor out of order
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 refrigerant
Shortage of water
Dirty water supply
Accumulated impurities
Water spilling out through curtain
Water solenoid valve not opening
Water leak in sump area
Water flow control plugged
Leak of water drain valve
SUGGESTED CORRECTION
Replace fuse & check for cause of
blown fuse
Turn switch to ON position
Replace P.C.Board
Check wiring
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.
Short of refrigerant.
Compressor cycles intermittently
Replace it
Replace it
Check circuit for overloading
Check voltage at the supply to the
building. If low, contact the power
company
Replace it
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
Check for leaks & recharge
See remedies for shortage of water
Use water softner or water filter
Use SCOTSMAN Ice Machine
cleaner
Check or replace curtain
Replace valve
Locate and repair
Replace water inlet valve
Replace valve
Page 35