Manitowoc Indigo Series Technician's Handbook page 138

2. Extremely Thin at Evaporator Outlet
There is no ice, or a considerable lack of ice formation,
at the outlet of the evaporator.
Examples: No ice at all on the outlet half of the
evaporator, but ice forms on the inlet half of the
evaporator. Or, the ice at the outlet of the evaporator
reaches 1/8 in. to initiate a harvest, but the inlet of the
evaporator already has 1/2 in. to 1 in. of ice formation.
3. Extremely Thin at Evaporator Inlet
There is no ice, or a considerable lack of ice formation
at the inlet of the evaporator. Examples: The ice at the
outlet of the evaporator reaches 1/8 in. to initiate a
harvest, but there is no ice formation at all on the inlet
of the evaporator.
4. No Ice Formation
The ice machine operates for an extended period, but
there is no ice formation at all on the evaporator.
Evaporator Tubing Routing
Routing of the tubing on the back of the evaporator
determines the ice fill pattern failure mode.
One Evaporator, One TXV models
The evaporator outlet tubing does not exit directly at
the top of the evaporator, but exits several inches
below the top of the evaporator. Extremely Thin at the
Evaporator Outlet will first be visible several inches
below the top of the evaporator. Extremely Thin at
Evaporator Inlet will first be visible at the bottom of the
evaporator.
Outlet
Inlet
138
ICE
Thin at Inlet
Part Number STH025 8/12
ICE
Thin at Outlet