Hoshizaki AM-50BAE-DS, AM-50BAE-AD Diagnostic Procedure Auxiliary Code C-0 and Earlier

1.Diagnostic Procedure: Auxiliary Code C-0 and Earlier

3)Power On/Initial Harvest Cycle. Move the control switch to the "ICE" position. Comp,

HGV, and WV energize. Initial harvest cycle starts. 50-sec. HT and 102-sec. WVT start.

a)Power On Diagnosis: If Comp, HGV, and WV do not energize, confirm appliance is plugged into electrical outlet. If optional drain pump HS-0248 or HS-5061 is installed, confirm the water level in the drain pump reservoir is not high enough to close the drain pump safety switch. When the water level lowers enough to open the drain pump upper float switch, power is restored to the icemaker. The pump motor remains energized as long as the drain pump lower float switch is closed. If optional drain pump is not installed, check that jumper connection is good. Next, check for 115VAC at control switch #2 (BR) to neutral (W) then at control switch #1 (O) to neutral (W). If 115VAC is present at #2 (BR) to neutral (W) and not at #1 (O) to neutral (W), replace control switch. Check BC continuity. If open, warm BC thermostat bulb with hand. See "II.D. Bin Control Check." If BC does not close, replace BC. If BC is closed and HGV or WV is not energized, check for 115VAC at CB U (BK) to CB V (W). If

115VAC is not present, check wiring. If 115VAC is present, see "d) HGV Diagnosis" or "e) WV Diagnosis" below.

b)BCH Diagnosis: If BCH does not energize, check BCH continuity. If open, replace BCH.

c)Comp Diagnosis: If Comp does not energize, check PTC relay continuity. If open, replace PTC. If closed, check Comp external protector and motor winding continuity. Replace as needed.

d)HGV Diagnosis: If Comp is energized and evaporator is not warming, check that HGV energizes and opens. If not, check for 115VAC at CB C1 (BK) to neutral (W) and at CB B1 (P) to neutral (W). If 115VAC is present at CB C1 (BK) to neutral (W) and not at CB B1 (P) to neutral (W), replace CB. If 115VAC is not present at CB

C1 (BK), check wiring connections from BC. If 115VAC is present, check HGV coil continuity. Replace as needed.

e)WV 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 C2 (BK) to neutral (W) and CB A2 (V) to neutral (W). If 115VAC is not present at CB C2 (BK), check wiring from BC. If 115VAC is present at CB C2 (BK) to neutral (W) and not at CB A2 (V) to neutral (W), replace CB. If 115VAC is present and WV does not energize, check WV coil continuity. If open, replace WV.

f)Initial Harvest Cycle Termination Diagnosis: 50-sec. HT terminates and freeze cycle starts. If not, replace CB.

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