Toshiba HWS-1402H-E, HWS-802XWHT6-E, HWS-802H-E, HWS-802XWHM3-E Method of Defect Diagnosis

9 Method of Defect Diagnosis

In order to diagnose the defective part of the heat pump system, first understand the symptom of the defect.

(1)Check the operation status. (It does not move, or it moves but stops, etc.)

(2)Flashing display on the display part of the hydro unit.

(3)Check the “check code” by the remote control.

Please refer to the following procedure of defect diagnosis for the identification.

No.	Procedure of defect diagnosis			Remark
	Matters to be confirmed first	9-1-1 Check the power supply voltage		Check the power supply for the heat pump
		9-1-2 Check for any miswiring of the connection		hot water heater, the crossover between
9-1			cables between the hydro unit and the	the hydro unit and the outdoor unit, and the
			outdoor unit	installation of temperature sensors.
		9-1-3	About the installation of the temperature
			sensor
9-2	Non-defective operation (program operation)			Non-defective program operations for the
				protection of the heat pump unit.
	Outline of the determination	9-3-1 Procedure of defect diagnosis		With reference to the "check code",
	diagram	9-3-2 How to determine from the check code		roughly identify the defect from the defect
			display on the remote controller	diagnosis for the heat pump hot water
9-3
		9-3-3 How to cancel a check code on the		heater and determine the defective part
				from individual symptoms.
			remote controller
		9-3-4 How to diagnose by error code
	Diagnosis flow chart for each	9-4-1	Hydro unit failure detection
9-4	error code	9-4-2	Outdoor unit failure detection
		9-4-3 Temperature sensor, temperature-
			resistance characteristic table
	Operation check by PC board	9-5-1 Operation check mode		The operation check mode allows to
9-5				determine good or not by checking the
				operation of the 4-way valve, 2-way valve
				and pulse motor valve.
9-6	Brief method for checking the	9-6-1 Hydro unit		How to determine the presence of any
	key components	9-6-2 Outdoor unit		defect particularly in functional parts.

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