Scotsman NU150 - Page 15

NUUndercounterIceMakerUserManual TroubleshootingTable
B13
Symptom Possible Cause Suggested Correction
Unit does not
run
Abnormal power supply Check the power supply voltage, if no voltage,
check the power line
Check the power supply voltage, if it is low, contact
the power company
The fuse on the PC board
blew
Replace the fuse. If the fuse is breaks again, check
the cause.
The machine stopped
abnormally (such as high
temperature protection)
Press the MODE key on the PC board to reset, the
machine starts or starts automatically two hours
later or unplug the power plug and plug it again
three minutes later, the machine starts.
Bin full Adjust the position of the ice cubes in the storage
bin to let the ice chute reset and then start the
machine
Abnormal water supply See the processing method for water-shortage
Compressor
cycles
intermittently
Low voltage Check circuit for overloading
Non-condensable gas in
system
Check the power supply voltage, if it is low, contact
the power company
Purge the system and re-charge
Compressor starting device
has loose wires
Check for loose wires in the starting device
Mechanical problem Replace compressor
Cubes too
small
Ice making cycle too short Check the distance between the ice thickness
sensor and the evaporator plate
Expansion valve partially
blocked
Check the expansion valve, if damaged, replace
it
Moisture in the system Purge the system and re-charge
Shortage of water See the processing method for water-shortage
Shortage of refrigerant Check for leaks in the refrigeration system and
recharge
Cloudy ice
Shortage of water See the processing method for water- shortage
Dirty water supply Use water softener or a water filter
Accumulated impurities Cleaning according to the procedure
Water temperature sensor
failure
Replace the water temperature sensor
Shortage of
water
Water spilling out through ice
chute
Tighten the screws on the clamping plate of the
PVC pipe to reduce the water flow
Water inlet solenoid valve not
opening
Check, if damaged, replace it
Water leak in water tank Check for the leaking points and repair them.
If necessary, replace it.
Water inlet valve blocked Replace the water inlet valve
Water drain valve leaking Check, if damaged, replace it