SERVICE DIAGNOSIS: Condition - No Ice Being Produced
STATUS:
ICE MAKER DOES NOT OPERATE
H. Check: The gear motor, if it will not run, the compressor will not run. If no power to it:
Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light
should be OFF .
1. If the bin empty and no water lights are off, check the transformer.
a. Transformer "load" side should have 12 to 15 volts. If not, check the "line" side. The line
side should have between 110-120 volts (60 cycle units). If the line side has the correct voltage
the load side does not, replace the transformer.
2. If the transformer is good, and the bin empty light is OFF, check the ice level sensors.
a. Remove sensors by pulling them out of the ice chute grommets. Visually inspect them,
clean if needed.
b. Look through the ice chute "eye" hole for something blocking the ice chute.
c. If the unit still does not run, replace the ice level sensors.
d. If the bin empty light is still OFF, check the circuit board.
1. Unplug "opto trans" and "LED" connectors from the circuit board.
2. Plug "opto trans" and "LED" connectors from the Scotsman Electronic Control
Tester Model NM1 into the circuit board.
a. Move the "bin full" switch on the tester to the full position. The bin full light
on the tester should be ON, if not, replace the circuit board.
If the bin full light on the tester is ON, move the tester switch to "bin empty"
the light on the tester should go OFF and the bin empty light on the circuit
board should go ON. If not, replace the circuit board. If it does as above,
and the machine still does not run, replace the ice level sensors.
3. If the transformer is fine, and the "no water" light is ON, check the water level sensor.
a. Check the water level in the reservoir, restore if low. If the water level is ok:
b. Remove the water level sensor from the reservoir and clean the tip if dirty.
CAUTION: THE TIP IS MADE OF GLASS
c. Replace the water level sensor. If the no water light is still on, check that the
"water sen" plug is firmly plugged into the circuit board.
d. If the no water light is still on,
1. Unplug the "water sen" connector from the circuit board.
2. Plug "water sen" connector from the Scotsman Electronic Control tester into
the circuit board.
a. Move the water switch on the tester to "no water" and the no water light
on the circuit board should go on. If not, replace the board.
b. Move the water switch to the "water" position, the no water light should
go off, if not, replace the circuit board.
c. If after the above, the machine still will not run, replace the water level
sensor
MORE INFORMATION ON THE CIRCUIT BOARD TESTER IS LOCATED AT THE END OF THE
MANUAL.
NDE550 & NDE650
April 1997
Page 22
