Hoshizaki KM-901MAH, KM-901MWH, KM-901MRH/3 service manual Other

Page 67

Problem	Possible Cause		Remedy

[2] Cloudy or irregular	a) Evaporator	1. Frozen up.	1. See chart 2.
cubes.
cubes.		2. Scaled up.	2. Clean
		2. Scaled up.	2. Clean

		3. Damaged.	3. Replace.

	b) Water System	1. Water supply line too	1. Increase water line size.
		small; requires 3/8"
		OD line dedicated per
		machine.
		2. Water filter clogged or	2. Replace filter or install a
		flow rate too small.	higher flow rate filter.

		3. High hardness or	3. Install a water softener or
		contains impurities.	filter.

	c) Spray Guide	1. Dirty.	1. Clean.

5. Other

	Problem	Possible Cause		Remedy

	[1] Icemaker will not stop	a) Thermostatic Bin	1. Set too cold.	1. See "IV.C.1. Thermostatic
	when bin is filled with	Control		Bin Control Check."
	ice.
	ice.		2. Defective.	2. Replace.
			2. Defective.	2. Replace.

		b) Mechanical Bin Control	1. Movement restricted.	1. Check and free.
			2. Loose connection.	2. Check and reconnect.

			3. Defective	3. See "IV.C.2. Mechanical
				Bin Control Check and
				Cleaning."

		c) Control Board ("G"	1. Defective.	1. See "IV.B. Control Board
		control board with		Check."
		mechanical bin control)

	[2] Abnormal noise.	a) Pump Motor	1. Bearings worn out.	1. Replace.
		b) Fan Motor (except	1. Bearings worn out.	1. Replace.
		water-cooled model)
		water-cooled model)	2. Fan blade deformed.	2. Replace.
			2. Fan blade deformed.	2. Replace.

			3. Fan blade does not	3. Replace.
			move freely.

		c) Compressor	1. Bearings worn out or	1. Replace.
			cylinder valve broken.

			2. Mounting pad out of	2. Reinstall.
			position.
		d) Refrigerant Lines	1. Rub or touch other	1. Reposition.
			lines or surfaces.

	[3]Ice in storage bin	a) Drain Line(s)	1. Plugged.	1. Clean.
	often melts.
	often melts.	b) Icemaker and Bin	1. Drains not run	1. Separate the drain lines.
		b) Icemaker and Bin	1. Drains not run	1. Separate the drain lines.
			separately.

		c) Ice Cube Guide	1. Out of position.	1. Place in position.
			Circulated water falls
			into bin.

67

Image 67

Contents KM-901MAH KM-901MWH Hoshizaki AMERICA, INC Contents Page Page Unit Important Safety InformationSerious injury Indicates important information about the use and care1a. KM-901MAH air-cooled Auxiliary Code T-0, U-0 Specifications Icemaker1b. KM-901MAH air-cooled Auxiliary Code U-1 and Later Water Cooled Condenser 2a. KM-901MWH water-cooled Auxiliary Code T-0, U-02b. KM-901MWH water-cooled Auxiliary Code U-1 and Later 3a. KM-901MRH remote air-cooled Auxiliary Code T-0, U-0 3b. KM-901MRH remote air-cooled Auxiliary Code U-1 and Later 4a. KM-901MRH3 remote air-cooled Auxiliary Code T-0, U-0 4b. KM-901MRH remote air-cooled Auxiliary Code U-1 and Later Condenser Unit Model URC-9F SpecificationsKM-901MAH air-cooled II. General Information ConstructionKM-901MWH water-cooled KM-901MRH/3 remote air-cooled Sequence Cycles and Shutdown Sequence of OperationControl Board Auxiliary Code T-0, U-0 Control Board Auxiliary Code U-1 and Later ShutdownOFF Cycle at Shutdown Mechanical Bin Control Activation Bin Full Control Board Sequence Flow ChartSequence Flow Chart CycleFill Cycle Control Board Auxiliary Code U-1Later Minute Harvest Cycle Freeze Cycle Pump-Out CycleControl Board Control Board Control Board LayoutPart Number 2A3792-01 Maximum Water Supply Period 6 minutes Harvest Backup Timer and Freeze TimerHigh Temperature Safety Low Water SafetyEnergized Time LEDs are On Components Min Max Avg LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Sequence StepControl Board Auxiliary Code U-1 and Later S4 Dip Switch S4 Dip Switch No Controls and AdjustmentsDefault Dip Switch Settings Harvest Timer S4 dip switch 1Pump-Out Frequency Control S4 dip switch 5 Pump-Out Timer S4 dip switch 3S4 Dip Switch Setting Time seconds Inlet Control Board S4 Dip Switch Setting Pump Motor Time seconds Bin Control Selector/Harvest Pump Timer S4 dip switchFactory Use S4 dip switch Control Board S4 Dip Switch Setting Bin ControlS4 Dip Switch Setting Time Minutes Freeze Timer S4 dip switch 9Float Switch Control S5 dip switch 1 G Control Board Refill Counter S5 dip switch 2 through 5 G Control BoardThermistor Float SwitchControl Switch Bin ControlWater Pump Switch Discharge Line ModelCooled-AirWater-Cooled Model PressureHigh* Switch Wiring DiagramsKM-901MAH air-cooled and KM-901MWH water-cooled KM-901MRH remote air-cooled PressureSwitchHigh KM-901MRH3 remote air-cooled Cooled-AirModel High* Pressure Switch Cooled-WaterModelHigh Pressure Switch SwitchPressure Performance Data 1570 912835 1480KM-901MRH remote air-cooled KM-901MRH3 remote air-cooled Diagnostic Procedure IV. Service DiagnosisPage OFF Shutdown Thermostatic Bin Control Auxiliary Code T-0, U-0 Control Board CheckControl Correct LED Board Lighting Sequence Bin Control CheckMechanical Bin Control Check Mechanical Bin Control Cleaning Float Switch Check Float Switch Check and CleaningFloat Switch Cleaning Thermistor Check Problem Possible Cause Remedy Diagnostic ChartsNo Ice Production Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Problem Possible Cause Remedy Low Ice Production Abnormal Ice Other Service for Refrigerant Lines Removal and Replacement of ComponentsRefrigerant Recovery Evacuation and Recharge R-404A BrazingRemoval and Replacement of Compressor Removal and Replacement of Expansion Valve Page Removal and Replacement of Evaporator Removal and Replacement of Air-Cooled Condenser Removal and Replacement of Water-Cooled Condenser Removal and Replacement of Remote Air-Cooled Condenser Page Adjustment of Water Regulating Valve water-cooled model Removal and Replacement of Thermistor Removal and Replacement of Inlet Water Valve Removal and Replacement of Pump Motor Removal and Replacement of Control Board Cleaning and Sanitizing Instructions VI. Cleaning and MaintenanceCleaning Procedure Sanitizing Procedure Following Cleaning Procedure Preparing the Icemaker for Long Storage MaintenanceDrain the water tank