Service Manual

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7) Startup – Move the power switch to the "ON" position, then move the control switch to
the "ICE" position to start the automatic icemaking process. Diagnosis: Check that CB
"POWER" LED is on. If not, check for proper power supply voltage (115VAC) input to
CT. If 115VAC is not present, check the breaker, power switch, and front panel safety
switch. Next, check that the power protect relay is de-energized and contacts between
terminals #6(BRwire) and #2 (BK wire) are closed. Check for proper control voltage
(10.5VAC) output from CT to CB K4 connector pin #1 (BR wire) to CB K4 connector pin
#2 (LBU wire). If 10.5VAC is not present and 10.5VAC 0.5A fuse is good, replace CT. If
10.5VAC is present and "POWER" LED is off, replace CB.
8) Fill Cycle – Reservoir is empty. LF/S and UF/S are open. WV energizes and ll cycle
starts. LF/S closes. Nothing happens at this time. Reservoir continues to ll. UF/S
closes. WCR energizes, closing low water safety circuit (WCR terminals #6 (GY wire)
and #4 (O wire)) and de-energizing WV. GM energizes. Diagnosis: If reservoir is empty
and WV is off, conrm LF/S status. See"IV.E. Float Switch Check and Cleaning." Check
that WV energizes and water lls the reservoir. If not, check that the water supply line
shut-off valve is open, possible clogged water lters, and clogged WV screen. If LF/S
is open and WV is off, check for 24VAC at CB K2connector pin #7 (R wire) to CB
K2connector pin #8(LBUwire). If 24VAC is not present and the 24VAC 1A fuse is
good, replace CT. If 24VAC is present, check for 24VAC at K3connector pin #3(DBU
wire) to a neutral (LBUwire). If 24VAC is not present, replace CB. If 24VAC is present,
check for 24VAC at the control switch (Rwire) to a neutral (LBU wire). If 24VAC is not
present, make sure the control switch is in the "ICE" position. Replace the control switch
if defective. If 24VAC is present, check for 24VAC at WCR terminal #1 (BR wire) to WCR
terminal #5(R wire). If 24VAC is present, WCR is energized or defective. If energized,
check that UF/S is open. See "IV.E. Float Switch Check and Cleaning." If not energized,
replace WCR. If 24VAC is not present, check WCR terminal #1 (BR wire) to a neutral
(LBU wire). If 24VAC is present, check WV solenoid wire connections and continuity.
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UF/S.See"IV.E.FloatSwitch
Check and Cleaning." If UF/S is closed, check that WCR energizes, de-energizing WV.
If not, check for 24VAC at WCR terminal#7(BKwire) to WCR terminal #8 (LBU wire). If
24VAC is present and WV does not de-energize, replace WCR. If WV de-energizes and
water continues to ll the reservoir, replace WV.