Koolaire STH045 8/15 Technician's Handbook page 54

Step 1 Disconnect power to the ice machine, remove
the electrical panel to allow viewing of the control
board lights. Disconnect the harvest float switch wire
from the control board and place a jumper on the
control board harvest switch terminals.
Step 2 Bypass the freeze time lock-in feature by
moving the toggle switch Off/On to cycle the ice
machine on. Wait until water flows over the evaporator,
then refer to chart.
Result
10 seconds into the freeze
cycle the ice machine cycles
from freeze to harvest and
the control board harvest
light energizes.
The harvest light comes on,
but the ice machine remains
in the freeze cycle.
The harvest light stays off
and the ice machine remains
in freeze.
54
Correction
The ice thickness float
switch, connectors or wiring
are causing the
malfunction.
The ice machine is in a 6
minute freeze lock - Cycle
on/off and retest.
Replace the control board.
Part Number STH045 8/15