Hoshizaki KM-1301SWH-E, KM-1301SRH-E Low Ice Production Possible Cause Long Harvest Cycle

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3. Low Ice Production

Low Ice Production - Possible Cause

	Long Harvest Cycle

1. Evaporator	a) Scaled up.

2. Spray Tubes and/or Spray	a) Dirty.
Guides	b) Out of position.
	b) Out of position.

3. Refrigerant Charge	a) Low.

4. Water Supply	a) Low water pressure.

	b) External water filters clogged.
	c) Insufficient water line size.
	Minimum 3/8" nominal ID (10 mm nominal OD)

	d) Too cold.

5. Control Board	a) Thermistor connection loose (K3).
See "IV.B. Control Board Check."
See "IV.B. Control Board Check."	b) Defective.
6. Thermistor	a) Loose, disconnected, or defective.
See "IV.E. Thermistor Check."

7. Hot Gas Valve	a) Erratic or closed.

8. Inlet Water Valve	a) Water valve screen clogged.

9. Compressor	a) Inefficient or off.

10. Liquid Line Valve (if applicable)	a) Erratic or open.
11. Expansion Valve (TXV)	a) Defective.

12. Water Regulating Valve	a) Leaking by.
(water-cooled model)

	Long Freeze Cycle

1. Evaporator	a) Scaled up.
2. Refrigerant Charge	a) Low.

3. Air Filter (air-cooled model)	a) Clogged.

4. Condenser (air-cooled and	a) Clogged.
remote air-cooled models)

5. Condenser (water-cooled model)	a) Water temperature out of specification.
6. Control Board	a) Float switch connection loose (K5).
See "IV.B. Control Board Check."
See "IV.B. Control Board Check."	b) Defective.

7. Hot Gas Valve	a) Erratic or open.

8. Inlet Water Valve	a) Leaking by.
9. Float Switch	a) Float does not move freely or defective switch.
See "IV.D. Float Switch Check
and Cleaning."

10. Compressor	a) Inefficient or off.

11. Pump Motor	a) RPM too slow.

12. Liquid Line Valve (if applicable)	a) Erratic or closed.
13. Expansion Valve (TXV)	a) Bulb loose.

	b) Defective.

14. Headmaster (C.P.R.) (remote	a) Not bypassing.
condenser unit)

15. Water Regulating Valve	a) Out of adjustment.
(water-cooled model)
See "IV.F. Adjustment of Water
Regulating Valve."

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Contents Superior Degree Reliability Hoshizaki AMERICA, INC Contents Page Indicates important information about the use and care Important Safety InformationSerious injury UnitSpecifications Icemaker KM-1301SAH-E air-cooledKM-1301SWH-E water-cooled KM-1301SRH-E remote air-cooled Condenser Unit URC-14FESpecifications II. General Information Construction KM-1301SWH-E water-cooled Separators Minute Fill Cycle Sequence of OperationSequence Cycles and Shutdown Initial Harvest CyclePump-Out Cycle S4 Dip Switch Setting Pump-Out 1st Pump-Out FrequencyFreeze Cycle Harvest CycleMechanical Bin Control KM-1301SWH-E, KM-1301SRH-E Cycle at Shutdown Mechanical Bin Control ActivationPump-Out Cycle Sequence Flow ChartCycle Steps Minute Fill Harvest Cycle Mechanical BC Bin Full Shutdown and RestartControl Board Control Board Layout Control BoardSequence Step LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Time LEDs are OnHarvest Timer S4 dip switch 1 Controls and AdjustmentsDefault Dip Switch Settings Time seconds Inlet Pump-Out Timer S4 dip switch 3Pump-Out Frequency Control S4 dip switch 5 Freeze Timer S4 dip switch 9 Harvest Pump Timer S4 dip switchFactory Use S4 dip switch S4 Dip Switch Setting Pump Motor Time secondsRefill Counter S5 dip switch 2 through Control SwitchFloat Switch Control S5 dip switch Tank Water Tank Headmaster Service Drier Valve Thermistor KM-1301SAH-E air-cooled Wiring DiagramsAuxiliary Code T-0, U-0 U-0 Auxiliary CodeAuxiliary Code U-1 and Later PressureSwitch KM-1301SRH-E remote air-cooled Performance Data 1780 13301240 13351950 12701142 2070IV. Service Diagnosis Diagnostic ProcedurePage S4 Dip Switch Setting Pump-Out 1st Pump-Out Frequency Shutdown Thermostatic Bin Control KM-1301SAH-E Mechanical Bin Control KM-1301SWH-E, KM-1301SRH-EControl Board Check Mechanical Bin Control Check Bin Control CheckThermostatic Bin Control Check KM-1301SAH-E Single Unit Connection Detail Stacked Unit Connection DetailMechanical Bin Control Cleaning Float Switch Check and Cleaning Float Switch CheckFloat Switch Cleaning Adjustment of Water Regulating Valve water-cooled model Thermistor CheckNo Ice Production Possible Cause Diagnostic ChartsNo Ice Production No Ice Production Possible Cause Freeze Up Freeze Up Possible Cause Harvest CycleFreeze Up Possible Cause Freeze Cycle Long Freeze Cycle Low Ice ProductionLow Ice Production Possible Cause Long Harvest Cycle Refrigerant Recovery Replacement of ComponentsService for Refrigerant Lines Brazing Evacuation and Recharge R-404APage Important Notes for Component Replacement ComponentVI. Cleaning and Maintenance Cleaning ProcedureIce Chute Float Switch Assembly Drain Plug Sanitizing Procedure Following Cleaning Procedure Maintenance Remove the water from the icemaker water supply lineDrain the water tank