Service Diagnosis - Scotsman TDE550 Service Manual

SERVICE DIAGNOSIS

Symptom
No ice made, nothing operates
Unit operates, no ice is vended
Compressor on, auger motor is
off
Compressor does not operate
Possible Cause
Unit off due to no power
Unit off due to master switch in
OFF position
Unit off due to low water level
Unit off due to ice level sensors
(photo-electric eyes) blocked
Unit off due to scale on water
level sensor
Unit off due to water
temperature too high
Unit off due to auger motor
overloaded (only up to serial
number 804817-05M)
Check for ice in the bin
Check for jam up of ice in
dispense chute
If there is ice, check that the bin
vane rotates. if not
If there is power to the bin drive
motor, but the vane does not turn
Auger motor windings open
Contactor stuck
Off due to high pressure control
open
Contactor coil is open
Contactor contacts do not make Replace contactor
Start capacitor failed
Potential relay failed
Compressor windings open
Compressor locked
November 1995
Page 21
TDE550 & TDE650
Probable Correction
Restore power
Switch master switch to ON
Check water supply, filter,
strainer, float valve. Correct
water supply
Check/clean ice level sensors
Clean water level sensor
Thermistor will shut down unit at
temperatures over 110
Check for: Scale on auger or
evaporator; top bearing wear or
lubrication; auger drive gear
reducer for wear.
If no ice, check that ice maker
can make ice
Check that machine cannot
keep up with needs
Pull chute down and allow ice to
fall out. Return chute to its
normal place.
Check for power to the bin drive
motor, if none, check condition
of Touch-Free ice sensor.
Disconnect electrical power,
remove all ice, check
mechanical condition of ice
vane. Replace if broken.
If ice vane is mechanically
sound, check bin drive, replace
if broken.
Replace auger motor
Replace contactor
Check condenser, fan motor,
fan blade, or water supply on
water cooled.
Replace contactor
Replace start capacitor
Replace relay
Replace compressor
Replace compressor
o
F.