Water Level Sensor - Scotsman C2648 Service Manual

C2648 Prodigy and Prodigy Plus Service Manual

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 remove it from the sump cover. Test 1: Place one lead of the ohmmeter
on the longest probe and the other on the controller end of the red wire, there should be continuity. Test 2:
Place one lead on the controller end of the white wire and the other on the mid-length probe, there should
be continuity. Test 3: Place on lead on the controller end of the black wire and the other on the shortest
probe, there should be continuity. If not, clean the probes and recheck.
3. Test the controller's water level sensor circuit. Reconnect electrical power. Unplug harness from water
level sensor, the sump empty light should be ON. Jump harness wires white and black. The sump full light
should be ON. Jump harness wires white and red, the sump full and sump empty lights will be OFF. Check
harness wire by wire for continuity if there is no reaction from the controller during this test.
Water touching the sensor's short probe triggers the Sump Full light. No
water touching the mid-length probe triggers the Sump Empty light. During
most of the freeze cycle neither light will be on.
January 2015
Page 45