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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 9-1-1 Check the power supply voltage
9-1-2 Check for any miswiring of the connection
cables between the hydro unit and the
outdoor unit
9-1-3 About 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
9-3-1 Procedure of defect diagnosis
9-3-2 How to determine from the check code
display on the remote controller
9-3-3 How to cancel a check code on the
remote controller
9-3-4 How 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
9-4-1 Hydro unit failure detection
9-4-2 Outdoor unit failure detection
9-4-3 Temperature sensor, temperature-
resistance characteristic table
9-5
Operation check by PC board 9-5-1 Operation 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
9-6-1 Hydro unit
9-6-2 Outdoor unit
How to determine the presence of any
defect particularly in functional parts.
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 64 Monday, October 5, 2009 2:09 PM