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.
December 2008 Page 59
Sump
Empty Light
Sump Full
Light
