Scotsman BC0530 Service Manual page 39

BC0530 Service Manual
Problem
Water valve will not
close. Potable water
level continues to rise
after contacting the tip
of the highwater level
probe, during the fill
cycle.
Water valve will not
open. Potable water
level never reaches the
highwater level reach-
es the highwater level
probe, during the fill
cycle.
TROUBLE SHOOTING
Possible Cause
No voltage measured at water valve coil.
Water valve remains open because of wa-
ter supply problem.
No voltage measured at water valve coil.
Water valve remains open because of dirty
or defective water valve.
Line voltage measured at water valve coil.
Water level probes test OK, but line voltage
measured at water valve coil.
No voltage measured at water valve coil
because of an abnormal probe continuity
path.
Test controller and replace if defective.
No voltage measured at water valve coil
and controller output terminal because of
defective controller.
Water valve closes when water contacts
the tip of the low water level probe, be-
cause the low and highwater level probes
are reversed in the water level probe termi-
nal plug.
The water supply pressure must be a
minimum of 5 PSI (34 KPA) dynamic at
the water valve. Be sure that the supply
line is of adequate size. This is especially
important for liquid cooled models where
the potable water and condenser coolant
water are supplied by the same water
line. Check for restrictions in the wa-
ter supply line including clogged filters.
Check the water line strainer and clean it
if needed.
Disassemble and clean water valve if
needed. Make sure the bleed holes in
the valve diaphragm are open. Replace
water valve if defective.
Test for continuity through the high level
probe and the reference probe. Replace
the probe if the continuity is broken.
Test controller and replace if defective.
Be sure there is no continuity path be-
tween the probes through water or min-
eral deposits on probes through water
or mineral deposits on 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.
Relocate and reinstall the probe wires,
in the probe terminal plug or replace the
water level probe set.
March 2020
Page 39
Solution