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Page 24
TEST PROCEDURES
All electrical components in this ice machine can
be diagnosed with a volt-ohmmeter.
Curtain Switch:
1.
Test using the controller's indicator lights.
Observe SW1 or SW2. Open and close the
curtain in question. When the curtain is opened,
the SW light will be ON. When the curtain gets to
within a half inch of closing (at the switch) the SW
light will go OUT.
Note. As the Prodigy MVP series is equipped
with just one Curtain Switch, it's normal to
have one SW led always ON.
2.
Test with an ohmmeter. Disconnect electrical
power. Open the control box cover. Unplug the
curtain switch lead from the controller. Connect
an ohmmeter to the leads of the switch. Open
and close the curtain. When the curtain is closed,
the switch is closed and there will be continuity.
When the curtain is open, the switch is open and
the circuit will be open.
3.
Test the controller's curtain switch circuit by
jumping the connectors on J1 or J2 together.
Reconnect electrical power. When jumped, the
matching SW light will go out. When unplugged
or open, the SW light will be ON.
ICE THICKNESS SENSOR
1.
Test using the controller's indicator light.
Observe the Ready To Harvest light. Shut the
machine off. Use a wire to connect the metal part
of the Ice Thickness sensor to the evaporator or
simply remove the Ice Thickness Sensor and
touch its metal surface to the metal control box
wall. The Ready for Harvest light should go ON.
2.
Test with an Ohmmeter. Disconnect electrical
power. Open the control box cover. Unplug the
ice thickness sensor lead from the controller.
Connect an ohmmeter lead to the ice thickness
sensor lead, touch the other ohmmeter lead to
the ice machine chassis. There must be an open
circuit. If there is continuity, the sensor must be
replaced. If there is no continuity, touch the
ohmmeter lead to the metal part of the ice
thickness sensor. There should be continuity. If
open, check the ice thickness sensor for scale
build up. Clean and recheck. If still open, replace
the ice thickness sensor.
3.
Test the controller's ice thickness sensor
circuit by connecting a wire from J10 to ground.
Reconnect electrical power. The Ready for
Harvest light should go ON
WATER LEVEL SENSOR
1.
Test using the controller's indicator lights
(sump empty and sump full). Unit must be powered
up and there must be water in the sump. Add
some manually if needed. Locate water level
sensor. Release from sump cover and slowly lift
up until the mid-length probe is out of the water.
The sump empty light should come on, and if the
unit is on the inlet water solenoid valve will open
to fill the reservoir. Return the water level sensor
to its normal position. If the unit is on and calling
for ice the water will fill until the top probe is in
contact with it, at that time the sump full light will
switch ON.
2.
Test with an ohmmeter. Disconnect electrical
power. Open the control box cover. Unplug the
connector at J9. Locate water level sensor and
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