Hoshizaki KM-1301SWH/3 Service Manual

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2. "G" Control Board with Harvest Pump Timer Diagnosis
3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn
on. If yellow "BC OPEN" LED is on, check CB K4 jumper.
Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is
interrupted (K2 connector).
• Check CB using the steps in "II.C. Control Board Check."
• Conrm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,
conrm CB K4 jumper is in place. Otherwise, CB yellow "BC OPEN" LED is on
and appliance will not start.
a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm 10A fuse is good.
Check for 115VAC at control switch #1 (BR or BK) to neutral (W) then at control
switch #2(P) to neutral (W). If 115VAC is present on #1 (BR or BK) and not on
#2(P), replace control switch. If 115VAC is present on control switch #2 (P), check
for 115VAC at HPS (P) to neutral (W) then HPS (BK) to neutral (W). If115VAC is
present at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below.
If115VAC is present at HPS (BK), check for 10.5VAC at CB K2#1 red wire to CB K2
#2 red wire. If 10.5VAC is not present, check that the cleaning valve interlock switch
is closed. Next, check CT continuity. If open, replace CT.
b) HPS Diagnosis: Conrm FM is energized and fan blade turns freely. Conrm
condenser coil is not dirty. Conrm that the location meets installation requirements.
See the appliance's instruction manual for details. Conrm there are no restrictions in
the refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged
line set or tting, and fan blade for binding.
Let refrigeration circuit pressures equalize. If HPS does not reset and pressures
are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and
diagnose refrigeration circuit restriction.
4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks
for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp,
HGV, FMR energized), continue to step 5a. If FS is open, WV remains energized
through additional 1-min. ll cycles until water enters the water tank and FS closes
(low water safety protection during initial start up and at the end of each harvest).
Diagnosis: Check that water enters the water tank. If not, check that the water supply
line shut-off valve is open and screens or external lters are clear. Check for 115VAC
at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is
present, and WV does not energize, check for 115VAC at WV. If 115VAC is present,
check coil continuity. Ifopen, replace WV. If the water tank lls, but the appliance fails to
start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and
Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace
CB.

Hoshizaki KM-1301SWH/3 Specifications

General

Brand	Hoshizaki
Model	KM-1301SWH/3
Category	Ice Maker
Language	English