Hoshizaki 73168 service manual

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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