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2. Diagnostic Procedure
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, adequate
water pressure (10 to 113 PSIG), and proper voltage per unit nameplate.
Note: • When checking high voltage (115VAC), always choose a neutral (W) wire to
establish a good neutral connection.
• When checking low voltage (24VAC), always choose a neutral (LBU) wire.
• When checking control board DC voltage (5VDC), always place the red test lead
from the multimeter to CB red K4 pin #1 (pin closest to CB black K3 connector).
See "II.C. Control Board Check."
• To speed up the diagnostic process, the ice purge cycle may be bypassed by
pressing the "SERVICE" button on the control board after the gear motor starts.
WARNING! Risk of electric shock. Care should be taken not to touch live
terminals.
• If the icemaker is in alarm, see "III.B. LED Lights and Audible Alarm Safeties."
• CB monitors the following switches with 5VDC during the icemaking process:
Control Switch (CS), High-Pressure Switch (HPS), Float Switch (FS),
Compressor Control Relay (CCR), and Bin Control (BC).
When 5VDC is present across any of these switches, the switch is open.
1) Move the power switch to the "OFF" position, then unplug the power cord from the
electrical outlet. Remove the front, top, and left side panels.
2) Plug the power cord back into the electrical outlet, then move the power switch to the
"ON" position.
3) Move the control switch to the "DRAIN" position. CB "POWER OK" LED and "FLUSH"
(drain) LED turns on.
Diagnosis "POWER OK" LED: Check that CB "POWER OK" LED is on. If not, check
for 115VAC at control transformer brown (BR) wire to neutral (W). If 115VAC is not
present, check the power switch, power cord connection, 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 DV: If DV does not energize, check for 24VAC at CB K2 #10 (W/DBU) to
neutral (LBU). If 24VAC is not present, check control switch continuity. If open while in
the "DRAIN" position, replace control switch. If closed, check for 5VDC at CB red
K4 pin #1 (pin closest to CB black K3) to K9 #1 (W/BK) and to K9 #2 (W/BK). If 5VDC
is present between CB red K4 pin #1 (pin closest to CB black K3) and K9 #1 and not at
K9 #2 and control switch is closed, replace CB. If 24VAC is present, check for restricted
DV and DV solenoid continuity. Clean or replace as needed.
4) Allow the water system to drain completely. Move control switch to the "ICE" position.
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