Manitowoc RNS012, Technician'S Handbook

Page: 88 / 124

80 Part Number STH044 10/13
TOUCHLESS SENSOR ACTIVATED
Step 1 Verify line voltage is present at control board
wires #20 & #22. Note - If a blue indicator light is
energized on the touch pad the control board has line
voltage.
Step 2 Depress each selection on the touch pad.
• 1 or more LED’s do not energize/de-energize
when a selection is pressed - Replace touch pad
• Each touch pad LED energizes/de-energizes as
selections are pressed - Go to next step
Step 3 Verify line voltage is supplied to touchless
sensing control board at wires #49 & #50.
Will Not Dispense
• Disconnect wires from C (common) and NO
(normally open) terminals on the sensor control
board.
• Use an ohm meter to verify the switch is opening
and closing. Place hand in front of sensor, if the
sensor activates and closes the switch the sensor
is working correctly.
• If the sensor does not activate the switch,
disconnect the sensor wire from the sensor control
board. Short +5 and SIG.
•
If the contacts close replace the sensor.
•
If the contacts remain open replace the sensor
control board.