Part Number STH042 3/14 59
Ice Machine Does Not Cycle Into Harvest
when Water Loses Contact with the
Harvest Float Switch
NOTE: The ice machine will make a thick or double
slab when a new freeze cycle is started with ice
already present on the evaporator.
Two of the most common scenarios are:
• Power is cycled off/on with ice on the evaporator.
• The ice damper/bin switch is opened/closed in the
harvest cycle before the ice releases.
Remove all ice from the evaporator before starting
diagnostic procedures.
Freeze Time Lock-In Feature
The ice machine control system incorporates a freeze
time lock-in feature. This prevents the ice machine
from short cycling in and out of harvest. The control
board locks the ice machine in the freeze cycle for six
minutes. After six minutes a harvest cycle can be
initiated. To allow the service technician to initiate a
harvest cycle without delay, this feature is not used on
the first cycle after pressing the power button OFF and
back to ON.
Step 1 Disconnect power to the ice machine, remove
the electrical panel to allow viewing of the control
board lights and pull the wire connector for the harvest
float switch through the bulkhead and disconnect.
Attach a jumper wire to the wire terminals connected
to the control board.
Step 2 Bypass the freeze time lock-in feature by
pressing the power button to cycle the ice machine on.
Wait until water flows over the evaporator, then refer to
chart.
Result Correction
10 seconds into the freeze
cycle the ice machine cycles
from freeze to harvest and
the control board harvest
light energizes.
Refer to Float Switch
Diagnostics.
The harvest light stays off
and the ice machine remains
in freeze.
Proceed to Step 3
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