Service Diagnosis - Scotsman MF 47 Service Manual

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SERVICE DIAGNOSIS

SYMPTON
Unit will not run
No LED lighted-on
Bin full yellow LED glows with
no ice in the bin
No water yellow LED glows
Red-alarm LED glows
Red-alarm LED blinks
Reverse rotation yellow LED blinks Too hi evap. temperature
Reverse rotation yellow LED glows Gear motor turns on reverse
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 of water
Water too soft
High head pressure
Ambient temperature too low
3' stand by
Shortage or lack of refrigerant
Inoperative evaporator sensor
Too low gear motor rotating speed
Drive motor doesn't turn
Magnetic cylinder loose its magnetic Replace magnetic cylinder.
charge
Inoperative Condenser Sensor
Inoperative Evaporator Sensor
Low voltage
Non-condensable gas in system
Compressor starting device with
loose wires
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.
Install a mineral salt metering device
Dirty condenser. Clean
INOPERATIVE fan motor. Replace
Move unit in warmer location
None - Wait the elapsed of 3'
Check and charge refrigerant
system
Replace
Check stator winding and capacitor
Check rotor bearings, freezer bearings
and interior of freezer for scores.
Replace whatever worn or damaged.
Check for power, open circuit, etc.
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
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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