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MDT5N25 & MDT5N40
May 2001
Page 21
SERVICE DIAGNOSIS
Symptom Possible Cause Probable Correction
No ice made, nothing operates Unit off due to no power Restore power
Unit off due to master switch in
OFF position
Switch master switch to ON
Unit off due to low water level Check water supply, filter, strainer,
float valve. Correct water supply
Unit off due to ice level sensors
(photo-electric eyes) blocked
Check/clean ice level sensors
Unit off due to scale on water level
sensor
Clean water level sensor
Unit off due to water temperature
too high
Thermistor will shut down unit at
temperatures over 110
o
F.
Unit operates, no ice is vended Check for ice in the bin If no ice, check that ice maker can
make ice
Check that machine cannot keep
up with needs
Check for jam up of ice in
dispense chute
Pull chute down and allow ice to
fall out. Return chute to its normal
place.
If there is ice, check that the bin
vane rotates. if not
Check for power to the bin drive
motor, if none, check condition of
Touch-Free ice sensor.
If there is power to the bin drive
motor, but the vane does not turn
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.
Compressor on, auger motor is off Auger motor windings open Replace auger motor
Auger motor relay does not make Replace circuit board
Contactor stuck Replace contactor
Compressor does not operate Off due to high pressure control
open
Check condenser, fan motor, fan
blade, or water supply on water
cooled.
Contactor coil is open Replace contactor
Contactor contacts do not make Replace contactor
Start capacitor failed Replace start capacitor
Potential relay failed Replace relay
Compressor windings open Replace compressor
Compressor locked Replace compressor