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Hoshizaki HR24A service manual Evaporator is Frozen Up, Defrost Fails to Start or Terminate

Models: HR24A

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2. Evaporator is Frozen Up

2. Evaporator is Frozen Up

Evaporator is Frozen Up - Possible Cause

1.	Evaporator	a) Dirty.
2.	Evaporator Fan Motor	a) Defective.

3.	Control Board	a) Defective, not operating evaporator fan motor.

4.	Refrigerant/Refrigerant Lines	a) Gas leak, low charge.

		b) Refrigerant lines restricted.

3. Defrost Fails to Start or Terminate

Defrost Fails to Start or Terminate - Possible Cause

1. Control Board

a) Defective.

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Hoshizaki HR24A service manual Defrost Fails to Start or Terminate, Evaporator is Frozen Up - Possible Cause

Contents

Number Issued Undercounter Refrigerator Model HR24A“A Superior Degree of Reliability” HoshizakiHoshizaki America, IncComplete and detailed explanation of the problem HOSHIZAKI AMERICA, INC 618 Highway 74 SouthPeachtree City, GA Attn Hoshizaki Technical Support DepartmentCONTENTS VI. Cleaning and Maintenance Instructions A. CleaningB. Maintenance 1. ExteriorImportant Safety Information WARNING, continued I. Specifications B. Storage Capacity and DimensionsA. Electrical and Refrigerant Data 1. Storage Capacity2. Dimensions Unit mm inII. General Information A. Construction 1. HR24AB. Sequence of Operation aRefrigerator1. Startup 2. Cool Down4. Cool Down Restart 5. Defrost Initiation6. Defrost Termination 7. Energy Saving ModeHR24A Sequence Flow Chart 2. Sequence Flow Chart1. Startup 2. Cool DownC. Control Board and Display Module 1. Control Board Layout 2. Display Module LayoutD. Cabinet Temperature aAdjusting the Temperature Setpointb Manual Defrost 1. Default SettingsE. Display Module Icons F. Control Panel LockoutG. Alarm Safeties a High and Low Temperature Alarm Values AH or ALH.Service Menu a Service Menu Access1Enter Service Menu 2Service Menu Listb Service Menu Chart Defrost Do Not Adjust Service MenuFactory Setting UnitTemperature Alarm Do Not Adjust Service MenuFactory Setting UnitEvaporator Fan Motor Do Not Adjust Serial Network Do Not Adjust Service MenuFactory Setting UnitIII. Technical Data A. Refrigeration Circuit Left Side Perimeter Liquid Line Condenser DrierEvaporator Capillary Tube Evaporator Fan Motor CompressorB. Wiring Diagram 1. HR24AIV. Service Diagnosis A.Diagnostic Procedure2-min.Comp delay timer starts. Comp icon flashes until 2-min.Comp delay timer terminates. Diagnosis Check that CT LEDs and EvapFM icon turn on. Next, check that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC. If 5VDC is not present, check DS activation lever and DS continuity. Note DS contacts are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for 12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring connector for loose connection, EvapFM continuity, and fan blade for binding 12Energy Saving Mode 10Defrost B. Control Board CheckStartup and Cool Down C. Thermistor Check D. Diagnostic Chart 1.Appliance Not CoolingEvaporator is Frozen Up - Possible Cause 2. Evaporator is Frozen Up3. Defrost Fails to Start or Terminate 1.Refrigerant Recovery V. Replacement of ComponentsA.Service for Refrigerant Lines 2. Brazing 3.Evacuation and Recharge R-134aB.Important Notes for Component Replacement C. Door Reversal VI. Cleaning and Maintenance Instructions A. CleaningB. Maintenance When shutting down the appliance for more than one week, follow the instructions below VIII. Disposal