Table of Contents
Advertisement
MC0322 through MC2148
Air, Water, and Remote Cooled 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 all 3 wires togeater. 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.
Sump Empty Light
Sump Full Light
January 2022
Page 48
Advertisement
Table of Contents
