Hoshizaki 73168 service manual

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III. Service Diagnosis	25
A. Alarm Signals	25
1. High Temperature Alarm (E1)	27
2. Low Temperature Alarm (E2)	28
3. Cabinet Defrost Alarm (E3)	29
4. High Condenser Temperature Alarm (clogged filter) (E7)	30
5. Defrost Thermistor (cabinet) Malfunction Alarm (E8)	31
6. Condenser Thermistor Malfunction Alarm (E9)	32
7. Control Board Alarms (EA and ED)	33
B. Service Chart	33
1. No Operation	33
2. Cabinet Cooling	34
3. Rail Cooling	36
4. Cabinet Defrost	37
5. Other	38
IV. Removal and Replacement of Components	39
A. Service for Refrigerant Lines	39
1. Refrigerant Recovery	39
2. Brazing	40
3. Evacuation and Recharge (R-404A)	40
B. Removal and Replacement of Refrigeration System Cartridge	42
1. Refrigerant Recovery Procedure	42
2. Refrigeration System Pump‑Down Procedure	44
C. Removal and Replacement of Compressor	47
D. Removal and Replacement of Cabinet Evaporator	48
E. Removal and Replacement of Expansion Valve	49
F. Removal and Replacement of Liquid Line Valve	50
G. Removal and Replacement of Condenser	51
H. Removal and Replacement of Thermistors and Thermostat	52
1. Cabinet Thermistor	52
2. Defrost Thermistor	52
3. Defrost Thermostat	53
4. Rail Thermistor	53
5. Condenser Thermistor (clogged filter)	54
I. Removal and Replacement of Defrost Heater	54
J. Removal and Replacement of Fan Motors	55
1. Cabinet Fan Motor	55
2. Condenser Fan Motor	56
3. Rail Fan Motor	56
K. Removal and Replacement of Door Gasket	57
L. Door Re-Hinging and Drawer Conversion	57
V. Cleaning and Maintenance Instructions	58
A. Cleaning	58
1. Work Surface	58
2. Rail and Rail Cover	59
3. Exterior	59
4. Cabinet Interior	59

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Contents Superior Degree Reliability Number Issued Revised Hoshizaki AMERICA, INC Contents Page Page Important Safety Information Serious injuryIndicates important information about the use and care UnitSpecifications Nameplate Ratings DimensionsII. General Information Construction Power Switch ON, Rail Cooling Switch Normal or LOW Power Switch ON, Rail Cooling Switch OFFSequence of Operation Cool Down Restart Cabinet DefrostCabinet Defrost Power Switch ON, Rail Cooling Switch OFF Rail DefrostPower Switch ON, Rail Cooling Switch OFF Cabinet OperationPower Switch ON, Rail Cooling Switch Normal or LOW Position Rail CoolingCabinet and Rail Cooling Control Board Control Board LocationFront Rear Control Board LayoutLED Display and Service Lock-Out Alarm SignalService Menu Compressor Short Cycle ProtectionSwitch Settings Controls and AdjustmentsTemperature Display Energy Saving Mode Temperature SetpointCabinet Defrost Temperature Correction Factor Service Menu Service Menu AccessService Menu Chart Control Board Check Procedure Alarm SignalsControl Board Replacement Perimeter Heater Thermistor CheckCompressor Protector III. Service Diagnosis Alarm SignalsAlarm Priority Problem Reset, Corrections, and Adjustments High Temperature Alarm E1 Reset OptionsLow Temperature Alarm E2 Cabinet Defrost Alarm E3 High Condenser Temperature Alarm clogged filter E7 Possible Causes Defrost Thermistor cabinet Malfunction Alarm E85a. Secondary Defrost Thermistor Rail, not used Condenser Thermistor Malfunction Alarm E9 Control Board Alarms EA and ED Service ChartNo Operation Cabinet Cooling Problem Possible Cause Remedy Rail Cooling Cabinet Defrost Other Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery Brazing Evacuation and Recharge R-404APage Removal and Replacement of Refrigeration System Cartridge Refrigerant Recovery ProcedurePage Refrigeration System Pump‑Down Procedure Page Defrost Thermistor Rail Thermistor Removal and Replacement of Compressor Removal and Replacement of Cabinet Evaporator Removal and Replacement of Expansion Valve Removal and Replacement of Liquid Line Valve Removal and Replacement of Condenser Cabinet Thermistor Removal and Replacement of Thermistors and ThermostatDefrost Thermistor Defrost Thermostat Rail ThermistorRemoval and Replacement of Defrost Heater Condenser Thermistor clogged filterRemoval and Replacement of Fan Motors Cabinet Fan MotorCondenser Fan Motor Rail Fan MotorRemoval and Replacement of Door Gasket Door Re-Hinging and Drawer ConversionCleaning and Maintenance Instructions Work SurfaceRail and Rail Cover ExteriorCabinet Interior Door/Drawer GasketsMaintenance Power Supply ConnectionRail Condensate Pan Air FilterShutdown and Long Storage Refrigeration Circuit VI. Technical Information HPR100A-DWiring Diagrams HPR46A-D2a. HPR72A-D Auxiliary Code U-5 and Earlier 2b. HPR72A-D Auxiliary Code U-6 and Later Awaiting Data