Hoshizaki 73180 service manual Auxiliary Codes A-2 and Later

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2. Auxiliary Codes A-2 and Later

This diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, adequate water pressure (7 to 113 PSIG), and proper voltage per unit nameplate. When checking voltage (115VAC), always choose a neutral (W wire) to establish a good neutral connection.

1)Move the power switch to the "OFF" position, then unplug the unit from the electrical outlet.

2)Remove all ice from the storage bin.

3)Remove the rear panels.

4)Remove the clamp securing the drain plug, then lower the drain hose into a container. Remove the drain plug to drain the water from the evaporator assembly and reservoir. See Fig. 4.

5)After all of the water has drained, replace the drain hose, drain plug, and drain clamp in their correct positions.

6)Remove the front panel and louver. Remove the screws securing the control box, then gently pull out the control box. Remove the control box cover.

7)Plug the unit back in. Place the power switch in the "ON" position.

8)Fill Cycle – LF/S and UF/S open, BCH and WV energize. LF/S closes. Nothing happens at this time. Reservoir continues to fill until UF/S closes.

Diagnosis: Check that WV fills the reservoir. If not, check water supply line shut‑off valve, water filters, WV screen, power switch, and BC assembly. See "IV.C. Bin Control Check." Check 115VAC to WV. Check WCR terminal #2 (GY wire) to a neutral (W wire) for 115VAC. If 115VAC is not present, WCR is either energized or bad. If WCR is energized, check F/S. See "IV.D.1. Float Switch Check." If 115VAC is present, check for continuity through WV solenoid. If open, replace WV. Check that UF/S closes when reservoir is full. If not, check F/S. See "IV.D.1. Float Switch Check."

9)Freeze Cycle – UF/S closes. BCH remains energized. WCR, TDR, GM, FM, CR, and Comp energize. WV de‑energizes. Ice production starts 4 to 6 minutes after Comp energizes depending on ambient and water conditions.

Diagnosis: Check that WCR, TDR, GM, FM, CR, and Comp energize and WV

de‑energizes. If not, check WCR, TDR, GM external protector, GM windings (check when GM is cool), GM capacitor, voltage to FM, FM windings, fan blade binding, voltage on CR, PTC relay, voltage on Comp external protector, Comp terminals, Comp windings, and WV. If optional drain pump HS‑0248 is installed, see "IV.E. Optional Drain Pump HS-0248." If GM starts, but the auger does not turn, check the spline coupling between the auger and GM.

10)Refill/Low Water Safety – As ice is produced, the water level in the reservoir drops and UF/S opens. When UF/S opens, a latching circuit through LF/S and WCR keeps WCR, TDR, GM, FM, CR, and Comp energized. When LF/S opens, WCR de-energizes, cutting power to TDR terminal #5 (O wire) and starting FT. WV energizes. Water fills the reservoir, UF/S closes. WCR energizes, restoring power to TDR terminal #5 (O wire) and resetting FT. WV de-energizes. If UF/S remains open longer than 90 seconds,

FT terminates, cutting power to TDR terminal #9 (R wire). GM, FM, CR, and Comp de‑energize. WV remains energized until UF/S closes.

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Contents 100BAF-DS 100BAF-AD 100BAF-ADDS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Specifications 100BAF Auxiliary Codes A-1 and EarlierAuxiliary Codes A-2 and Later 100BAF-DS 100BAF-DS, 2. Auxiliary Codes A-2 and Later 100BAF-AD 100BAF-AD, 2. Auxiliary Codes A-2 and Later 100BAF-ADDS 100BAF-ADDS, 2. Auxiliary Codes A-2 and Later Auxiliary Codes Rear II. General Information ConstructionFront Auxiliary CodesIcemaking Unit Sequence of Operation Freeze CycleFill Cycle Auxiliary Codes A-1 and Earlier Auxiliary Codes A-2 and Later Wiring Diagram Auxiliary Codes A-2 and LaterIcemaker with Optional Drain Pump HS-0248 Performance Data 100BAF SeriesIce Production Check IV. Service DiagnosisDiagnostic Procedure Page Auxiliary Codes A-2 and Later Bin Control Check Float Switch Check Float Switch Cleaning Lower Float white Plastic Retainer ClipDrain Pump Check Optional Drain Pump HS-0248Overview Priming Instructions Float Switch Cleaning Diagnostic Charts No Ice Production Possible Cause StartupShutdown Fill Cycle and Refill Cycle Shutdown Refrigerant Recovery Removal and Replacement of ComponentsService for Refrigerant Lines Brazing Evacuation and Recharge R-134aImportant Notes for Component Replacement ComponentRemoval and Replacement of Evaporator Assembly Components Upper Bearing Wear Check Removal and Replacement of Extruding Head Removal and Replacement of Auger Removal and Replacement of Evaporator Page 5b. Lower Housing Page VI. Maintenance Maintenance Schedule Frequency Area TaskCleaning and Sanitizing Instructions Cleaning SolutionPage Sanitizing Solution Page Cleaning Solution Page Sanitizing Solution Storage Bin Drain Condenser VII. Preparing the Icemaker for Periods of Non-Use Auxiliary Codes A-1 and Earlier Skip to stepVIII. Disposal
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