Service Diagnosis: Bin Ice Level Control - Scotsman CME1202 User Manual

SERVICE DIAGNOSIS: Bin Ice Level Control

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.
Indicator light is out or
flickers, board may seem to
be off
PARTIAL
VIEW OF
CIRCUIT
BOARD
12-1912-01
DETERMINE CAUSE
A. Listen for a ticking sound from
transducer.
B. Remove front panel(s), 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.
On boards with a light, check by
moving switch & watching light.
Check connection to ice level switch Repair or replace harness to switch
PLUG - IN
RELAY
BIN THERMOSTAT
TIMER
CME1202R & CME1402R
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. 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
not, replace the board.
Replace ice level switch
June 1996
Page 27
Electrical Shock Hazard Can
Cause Personal Injury.
Disconnect Power Before
Servicing.
Bin Thermostat Posts at Line
Voltage.
POSTS MENTIONED IN
"B" ABOVE