Scotsman MDT4FA-1 Manual page 20

MDT3F & MDT4F
Service Diagnosis
PROBLEM
Unusual noise
No water is dispensed
Water drips from spout
Ice will not stop dispensing
Water leaks from cabinet
No refrigeration
POSSIBLE CAUSE
Mineral scale in evaporator
Auger coupling dry
Auger coupling worn
Bearings worn
Gear motor loose on frame
Low water level
Tubing vibrating
Tooth on a gear missing
Compressor too loud
Gear noise
Water Switch in Off position
Water switch open
Water solenoid plugged up
Water solenoid coil open
Vend system does not work
Water turned off
Melting ice in chute
Unit or bin not level
Water solenoid leaks thru
Ice jammed in spout
Vend system does not work
Evaporator water seal worn or
cracked
Tubing to evaporator leaks
Drain leaks
External drain restricted
Gear motor does not turn
Centrifugal switch does not close
Fan motor does not turn
Lack of refrigerant
Compressor does not pump
May 2001
Page 20
PROBABLE CORRECTION
Clean water system with ice
machine cleaner.
Grease coupling
Replace coupling and adapter
stand.
Replace bearings and water seal.
Tighten bolts, check grommets
Check water level in reservoir
Check tubing for contact
Check gears in auger drive
Replace compressor
Check gear motor for oil leak
Switch to ON
Replace switch
Clean inlet screen of solenoid
Replace solenoid
Check/replace vend system
Restore water supply
Some water dripping is normal
Level unit, check bin
Replace solenoid
Clear ice jam, check for cause
Check/replace vend system
Replace seal and bearings
Replace tubing/fittings
Check drain tubes and fittings
Clean out drain
Check motor
Check switch
Check fan motor
Add refrigerant, if problem is
reduced, locate leak and repair it.
Check/replace start capacitor
Check/replace start relay
Check/replace compressor