Manitowoc Indigo ID0302A, Technician'S Handbook

Page: 181 / 296

Part Number STH025 11/16 181
Diagnostics
ICE MACHINE CYCLES INTO HARVEST BEFORE ICE
CONTACTS THE ICE THICKNESS PROBE
Premature harvest symptoms
• Low ice production
• Thin ice in bin
• Freeze cycles are faster than published cycle times
1. Turn off power and inspect ice thickness probe for
physical damage. Look for bulging, cracks around
the nipple or deformed pivot pins.
2. Verify ice thickness probe gap is approximately 9/32
"
(7 mm)
3. Make sure the ice thickness probe wire doesn’t
restrict movement.
4. Perform Ice Thickness Probe tap test:
• Press the menu button, scroll down to Service,
press the right arrow, scroll down to Real Time Data,
press right arrow - With the brackets around Time
& Temp press the right arrow - Scroll down until
100Hz &120Hz are displayed. Slowly increasing and
decreasing numbers typically in the 200Hz to 300Hz
range will display to the right of 100Hz &120Hz.
• Lift the Ice Thickness Probe and continuously tap the
nipple while watching the numbers to the right of
the 100Hz and 120Hz. There is a slight delay while
tapping.
Pass Numbers increasing into the thousands indicates
a properly working ice thickness probe and
control board.
Fail Numbers do not move or do not increase into
the thousands - Ohm the ice thickness probe.