Manitowoc indigo series Technician's Handbook page 182

5. Ohm Ice Thickness Probe
NOTE: Verify meter leads are properly connected to VOM
with the red meter lead connected to positive & the black
meter lead connected to negative.
Lead tips must be needle style to make contact with
the terminal. Notched probes are too wide to make
• Disconnect Ice Thickness Probe from control board
• Connect red meter lead to the red wire and the black
meter lead to the black wire - Normal readings = 1.4
to 2.5 KΩ's.
• Reverse leads - Connect black meter lead to the
red wire, red meter lead to the black wire - Normal
readings = 1.2 to 1.5 KΩ's.
Pass
Fail
6. Check control board voltage
• Set VOM to DC voltage scale - Check voltage across
the top and bottom pin - Normal readings = 3.25 to
3.35 VDC.
Pass
Fail
182
contact and must not be used.
Ohm values are within range - Check control
board voltage at the ice thickness probe
Replace ice thickness probe.
Control board voltage is normal
connection.
Replace control board
Part Number STH025 11/16