Manitowoc I0320A, Technician'S Handbook

Page: 142 / 182

140 Part Number STH038 5/12
DIAGNOSTICS
1. Verify bin switch, damper and damper magnet are
in place.
• Press the Menu button.
• Scroll down to Service and press right arrow.
• Scroll down to Diagnostics and press right arrow
• Scroll down to Inputs and press right arrow to
display curtain switch readings (Curt SW1, Curt
SW2, etc).
2. Open and close the ice damper(s) repeatedly
while observing the display and control board
lights.
A. Curtain switch cycles open/closed and
control board light energizes/de-energizes -
Bin switch is operating normally
B. Curtain switch remains closed and control
board light remains on - Replace bin switch
C. Curtain switch remains open and control
board light remains off - Go to next step
3. Disconnect bin switch wire from control board.
4. Jumper control board bin switch wire to ground,
press the power button and observe the display
and control board lights.
A. Curtain switch closes, control board light
energizes and ice machine starts - Replace
bin switch
B. Curtain switch remains open and control
board light is off - Verify procedure was
correctly followed - Replace control board.