Service Diagnosis: Ice Level Control Circuit - Scotsman CME1002R User Manual

CME865R & CME1002R

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 (the compressor will
not operate until the liquid line
valve opens, but the pump should
be working if there is no ice in the
bin).
Machine runs, makes ice,
switches on and off, but ice level
cannot be controlled.
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.
DO NOT UNPLUG with power
connected. Examine the
transducer, the inside must be
clean and dry.
C. Check power to bin level
control board.
D. Disconnect electrical power
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. Replace ice level switch
PLUG - IN
BIN THERMOSTAT
TIMER
RELAY
September, 1994
Page 26
PROBABLE CORRECTION
If no noise, go to C. If there is a
noise, check for a light on the
board. 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. 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 go back
to machine circuit. If machine
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.
Electrical Shock Hazard
Can Cause Personal Injury.
Disconnect Power Before
Servicing.
Bin Thermostat Posts at Line
Voltage.
POSTS MENTIONED IN
"D" ABOVE