Hoshizaki SRH/3 KM-1400SWH-M, KM-1301SAH/3 G Control Board without Harvest Pump Timer Diagnosis

1."E" and "G" Control Board without 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.

•"E" Control Board: CB red "POWER OK" LED turns on.

•"G" Control Board: CB red "POWER OK" LED and green "BC CLOSED" LED turn on.

Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is interrupted (K2 connector).

•Check CB using the steps in "II.C. Control Board Check."

•"G" CB: If yellow "BC OPEN" LED is on, check that CB red K4 jumper is in place.

a)Power On Diagnosis: If CB red "POWER OK" LED is off, confirm closed BC and 10A fuse is good. If BC is open, remove ice from bulb and warm bulb in hand. If BC does not close, replace BC. See "II.D. Bin Control Check." Check for 115VAC at control switch #1 (BR) to neutral (W) then at control switch #2 (P) to neutral (W).

If 115VAC is present on control switch #1 (BR) and not on control switch #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 (R) to CB K2 #2 (R).

If 10.5VAC is not present, confirm that the cleaning valve interlock switch is closed. Next, check CT continuity. If open, replace CT.

b)HPS Diagnosis: Confirm FM is energized and fan blade turns freely. Confirm condenser coil is not dirty. Confirm that the location meets installation requirements. See the appliance's instruction manual for details. Confirm 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 fitting, 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-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 min., CB checks for a closed FS. If FS is closed, harvest cycle begins. If harvest cycle begins (Comp, HGV, and FMR energize), continue to step 5. If FS is open, WV remains energized through additional 1‑min. fill 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 filters 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 fills, 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.

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