Service Manual

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6) Startup–CB "POWER OK" LED is on. Turn on the power supply, then move the power
switch to the "ON" position. Make sure the control switch is in the "ICE" position. CB
"POWER OK" LED and
IS (BC1 if applicable) green LED turn on.
Diagnosis CB "POWER OK" LED: Check that CB "POWER OK" LED is on. If not,
check for 115VAC at control transformer brown (BR (BK on F-2001MLH)) wire to neutral
(W). If 115VAC is not present, check the power switch and breaker. If 115VAC is present,
check control transformer continuity. Replace as needed. Next, check for 24VAC at
control transformer red (R) wire to neutral (LBU). If 24VAC is not present, check control
transformer continuity. Replace as needed. If 24VAC is present, check 24VAC 1A fuse.
If fuse is good, check for 24VAC at CB K8 #1 (W/R) to CB K8 #2 (LBU). If 24VAC is
present and "POWER OK" LED is off, replace CB.
Diagnosis BC1 (infrared sensor): If "POWER OK" LED is on and BC1 green LED
is off, check 20VDC at CB K6 #1 (DBU) to CB K6 #3 (BR). If 20VDC is not present,
conrm dip switch 7 is in the "ON" position. If dip switch 7 is in the "ON" position and
20VDC is not present, replace CB. If BC1 yellow LED is on or ashing, move ice away
from lens. If no ice is present, clean the lens with a warm, clean damp cloth. If cleaning
the lens does not work, replace BC1.
Diagnosis BC(2) (mechanical stand-alone or backup): Check that the actuator
paddle is properly positioned. Check continuity across BC(2). If open, replace BC(2).
Next, check VDC at CB K8#3(GY) to CB K8 #4 (GY). When BC(2)is closed 0VDC is
read. Move the actuator paddle to open BC(2). When open, 5VDCis present between
CB K8 #3 (GY) and CB K8#4(GY). If 5VDC is not present when BC(2) is open, replace
CB. Return actuator to its normal position.
7) Fill Cycle – "WTRIN" LED is on. Reservoir is empty and LFS and UFS are open.
FT starts. WV energizes and ll cycle starts. LFS closes. Nothing occurs at this time.
Nothing happens at this time. Reservoir continues to ll until UFS closes. When UFS
closes, FT terminates, WV de-energizes, and CB "WTRIN" LED turns off. FZTand
30-sec. GM delay timer start. If UFS remains open longer than 90 sec. after LFS
opens, FTexceeded and CB sounds a 1-beep alarm. WVremains energized until UFS
closes. Alarm resets automatically when UFS closes. Diagnosis: If reservoir is empty
and "WTRIN" LED is off, conrm LFS status. See "II.E.1. Float Switch Check." IfLFS
is open and "WTRIN" LED is off, replace CB. If "WTRIN" LED is on, check that the
reservoir lls. If not, check water supply line shut-off valve, water lters, and WVscreen.
If "WTRIN" LED is on and WV is off, check CB K2 #8(O) to a neutral (LBU) for 24VAC.
If24VAC is not present, check CB K2 #9(W/R) to a neutral (LBU) for 24VAC. If 24VAC
is present on CB K2 #9(W/R)and not on CB K2 #8 (O), replace CB. If 24VAC is
present on CB K2 #8(O), check continuity through WV solenoid. If open, replace WV.
If WV is energized and rell exceeds FT with no water in the reservoir, check for DV
leaking. Ifreservoir is full and overowing check for open UFS. See "II.E.1. Float Switch
Check." If UFS is closed, check that WV de-energizes. If not, check CB K2 #8 (O) to a
neutral (LBU) for 24VAC. If 24VAC is present, replace CB. IfWV de-energizes and water
continues to ll the reservoir, replace WV.