Service Manual

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11) Rell Cycle/Low Water Safety – As ice is produced, the water level in the reservoir
drops. UFS opens. Nothing occurs at this time. When LFS opens, WV energizes, 90-sec.
low water safety timer (ll timer) starts. Comp, GM, CCR, and FM continue. When UFS
closes, WV de-energizes, 90-sec. low water safety timer (ll timer) terminates and
30-min. freeze timer resets. If UFS remains open 90 sec. after WV energizes (ll timer
exceeded), a 90-sec. shutdown cycle starts. Comp and FM de-energize and CB signals
a 1-beep alarm every 5 sec. 90-sec. ice purge timer starts. GM and CCR continue
to clear ice from the evaporator. 90-sec. ice purge timer terminates, GM and CCR
de-energize. WV and 1-beep alarm continue until UFS closes.
Diagnosis – Check that "WTRIN" LED is on. If not, check LFS. See "II.E. Float Switch
Check and Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN"
LED is on, check that the reservoir lls. If not, check the water supply line, restricted
water lters, WV solenoid, restricted WV screen. If WV is energized and rell exceeds
90-sec. low water safety timer (ll timer), check DV leaking by or open UFS.
See "II.E. Float Switch Check and Cleaning."
Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer resets
when UFS closes again. If UFS does not close again within 30 min., CB shuts down the
icemaker and sounds a 5-beep alarm every 5 sec. See "III.B. LED Lights and Audible
Alarm Safeties."
12) Shutdown
a) 2A4296-01: Dip switch 8 "ON" (dip switch 9 is irrelevant to shutdown on this
control board): Comp and GM should de-energize within 10seconds.
See "III.C.6. Bin Control Shutdown Delay, Agitation, and Ice Purge Timer (S1 dip
switch 8)."
b) 2A8054-01 and 2A9093-01: Dip Switch 8 "ON" and dip switch 9 "OFF":
Once dip switch 8 bin control delay timer (6 to 10 sec.) terminates, 90-sec. Comp
shutdown timer starts. Once 90-sec. Comp shutdown timer terminates, Comp and
FM de-energize and 60-sec. GM shutdown timer starts. Once 60-sec. GM shutdown
timer terminates, GM de-energizes. See "III.C.6. Bin Control Shutdown Delay,
Agitation, and Ice Purge Timer (S1 dip switch 8)" and "III.C.7. Bin Control Shutdown
Delay (S1 dip switch 9)."
BC Diagnosis: See "II.D. Bin Control Check."
CB Diagnosis: See "II.C.2b)a) Bin Control (BC)."
Legend: BC–bin control; CB–control board; Comp–compressor; CCR–compressor control
relay; CT–control transformer; DV–drain valve; EH–evaporator heater;
FM–fan motor; GM–gear motor; HPS–high-pressure switch; LFS–lower
oat switch; PPR–power protect relay; TXV–thermostatic expansion valve;
UFS–upper oat switch; WV–inlet water valve