Hoshizaki KM-1301SWJ/3 Service Manual page 23

a) Freeze Cycle Diagnosis: Confirm Comp, FM* (if connected to CB K1 connector pin
#9), FMR, and PM continue. Confirm that FM (if not connected to CB K1 connector
pin #9) and LLV energize. Confirm WRV opens. Next, confirm HGV and X10 relay
de-energize. During the first 5 min. of freeze, confirm evaporator is cooling. If not,
confirm WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV
and FM (if not connected to CB K1 connector pin #9) energize, TXV and HM operate
correctly, WRV opens, Comp is efficient, and refrigerant charge is correct. See
"VIII.A. Specification and Performance Data."
b) Comp, FM*, and FMR Diagnosis: If Comp. FM* (if connected to CB K1 connector
pin #9), and FMR de-energize once freeze begins, check that appliance has not
shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS Diagnosis" above.
If "POWER OK" LED is on, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral
(W). If 115VAC is not present and LED 1 is on, replace CB.
Comp: If 115VAC is present, check for 115VAC at CR or MC coil. If 115VAC is
present, check CR or MC coil and contact continuity. Replace as needed. If CR or
MC is okay, check Comp start relay and start and run capacitors. Next, check Comp
motor winding continuity. If Comp is energized but evaporator is not cooling, check
for an inefficient Comp. See "VIII.A. Specification and Performance Data."
FM*: If Comp is energized but FM* is not, check capacitor, motor winding, and fan
blade for binding.
FMR: If Comp is energized but FMR is not, check for 115VAC at the FMR junction
box. If 115VAC is not present, check icemaker wiring connections. If 115VAC is
present, check for voltage at condenser unit. If 115VAC is not present, check field
wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and
fan blade for binding.
c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to
neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB.
If 115VAC is not present, replace WV (bypassing). If HGV did not close at the end of
harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present and
LED 3 is off, replace CB. If 115VAC is not present, replace HGV (bypassing).
d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV. If PM
de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized,
check for 115VAC at control switch #5 (R) to neutral (W). If 115VAC is present at CB
K1 #4 (R) and not at control switch #5 (R), check control switch continuity between
#5 (R) and #4 (R). Replace as needed. If 115VAC is present at control switch #5 (R)
to neutral (W), check PM capacitor and motor winding continuity.
e) FM and LLV Diagnosis: If FM (if not connected to CB K1 connector pin #9) or LLV
does not energize, check for 115VAC at CB K1 #3 (BK) to neutral (W). If 115VAC is
not present, replace CB. If 115VAC is present:
For FM, check capacitor, motor winding, and blade for binding.
For LLV, check coil voltage and continuity.
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