Scotsman BC0530 Service Manual page 37

BC0530 Service Manual
Problem
Water plate will not
close after defrost.
Defrost does not initi-
ate when water level
drops below low water
level probe.
Defrost cycle ends and
water plate closes be-
fore all ice is out of the
evaporator.
TROUBLE SHOOTING
Possible Cause
Evaporator temperature probe is defective
and not sensing warm evaporator tempera-
ture.
Actuator motor output shaft is tuning but
front cam is not turning.
Actuator motor will not run. No voltage
measured at actuator motor.
Actuator motor will not run. No voltage
measured at actuator motor and controller
output terminal.
Actuator motor will not run. Voltage mea-
sured at actuator motor. Actuator motor or
capacitor defective.
Actuator motor overheated. Open thermal
overload.
Water level probe does not sense that the
water level is low.
Water level probes are OK but no voltage
measured at the controller output termi-
nals to the actuator motor, water valve or
defrost valve.
Evaporator temperature adjustment is set
too cold and terminates defrost too early.
The evaporator temperature probe has
poor contact with the evaporator and ter-
minates defrost too early.
Evaporator grids are distorted, slowing the
fall of the ice from the evaporator.
Test probe and replace if defective.
Cam pin is broken or missing.
Inspect operation of arms up and arms
down switches. Adjust or replace if
defective.
Test controller and replace if defective.
Replace defective actuator motor or ca-
pacitor. See actuator motor test proce-
dure for additional information.
Let motor cool and determine why motor
is running continuously.
Be sure there is no continuity path
between the probes through water or
mineral deposits on the probe cap. Make
sure the cap is clean and dry especially
after cleaning the ice machine.
Test controller and replace if defective.
Adjust evaporator temperature adjust-
ment counterclockwise (warmer) to
extend defrost time.
Be sure the evaporator temperature
probe is fully inserted into the evaporator
probe holder.
Carefully straighten grids or replace evap-
orator if the damage is severe.
March 2020
Page 37
Solution