Toshiba ESTIA HWS-1501CSHM3-E, Service Manual

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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
9-1
Matters to be confirmed first 9-1-1Check the power supply voltage
9-1-2Check for any miswiring of the
connection cables between the hydro
unit and the outdoor unit
9-1-3About the installation of the
temperature sensor
Check the power supply for the heat pump
hot water heater, the crossover between
the hydro unit and the outdoor unit, and the
installation of temperature sensors.
9-2
Non-defective operation (program operation) Non-defective program operations for the
protection of the heat pump unit.
9-3
Outline of the determination
diagram 9-3-1Procedure of defect diagnosis
9-3-2How to determine from the check
code display on the remote controller
9-3-3How to cancel a check code on the
remote controller
9-3-4How to diagnose by error code
With reference to the "check code",
roughly identify the defect from the defect
diagnosis for the heat pump hot water
heater and determine the defective part
from individual symptoms.
9-4
Diagnosis flow chart for each
error code 9-4-1Hydro unit failure detection
9-4-2Outdoor unit failure detection
9-4-3Temperature sensor, temperature-
resistance characteristic table
9-5
Operation check by PC board 9-5-1Operation check mode The operation check mode allows to
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
key components 9-6-1Hydro unit
9-6-2Outdoor unit How to determine the presence of any
defect particularly in functional parts.