Scotsman CMS1002W Manual page 19

SERVICE DIAGNOSIS: Ice Level Control Circuit
CONDITION
Ice Machine does not run, it has
power to it, the high pressure
control is closed, the on/off switch is
set to ON.
Machine runs, makes ice, switches
on and off, but ice level cannot be
controlled.
Machine runs, but will not shut off.
PARTIAL VIEW OF CIRCUIT BOARD 12-1912-01
DETERMINE CAUSE
A. Listen for a ticking sound from
transducer.
B. Open bin door and twist
transducer 1/4 turn and pull out.
NOT UNPLUG with power
connected
. Examine the
transducer, the inside must be
clean and dry.
Check power to bin level
C.
control board.
Disconnect electrical power
D.
and test ice machine circuit by
attaching a jumper wire between bin
thermostat posts on circuit board
part no. 12-1912-01 (the circuit
board with the timer on it).
Reconnect power.
E. Transducer or ice level board
assembly defective.
Ice level switch may be defective.
On boards with a light, check by
moving switch & watching light.
Board relay stuck closed. Check
relay.
PLUG - IN
RELAY
BIN THERMOSTAT
September, 1993
Page 19
CMS1002W
PROBABLE CORRECTION
If no noise, go to C. If there is a
noise, check for a light on the board
(models built after 4/93). If there is a
light on, check relay contacts N.O.
and COM. The contacts should be
CLOSED. If closed, go to D. If not,
replace the board. If light is off, or
prior model, go to B.
If the inside of the transducer
(above screen) was wet, replace it.
DO
Set bin level to FULL and aim at an
object about 1-3 feet away.
Machine should restart, if not go to
D.
Should be 12 volts from
transformer, if not replace
transformer. If there is power go to
D.
If machine does not start
to machine circuit.
starts, disconnect electrical power,
remove jumper wire and reconnect
electrical power. Then go to E.
Replace transducer. Set bin level to
FULL and aim at an object about
1-3 feet away. Machine should
restart. If this does not repair unit,
replace the board.
Replace ice level switch
If COM and N.O. are closed when
power is off, replace board. If open,
go to B above.
Electrical Shock Hazard Can
Cause Personal Injury.
Disconnect Power Before
Servicing.
Bin Thermostat Posts at Line
Voltage.
POSTS MENTIONED IN
"D" ABOVE
go back
If machine