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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 controller.
Please refer to the following procedure of defect diagnosis for the identification.
No.
Matters to be confirmed first
9-1
Non-defective operation (program operation)
9-2
Outline of the determination
diagram
9-3
Diagnosis flow chart for each
error code
9-4
Operation check by PC board
9-5
Brief method for checking the
9-6
key components
Procedure of defect diagnosis
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
9-3-1. Procedure of defect diagnosis
9-3-2. How to determine from the check
code 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
9-4-1. Hydro unit failure detection
9-4-2. Outdoor unit failure detection
9-4-3. Temperature sensor, temperature-
resistance characteristic table
9-5-1. Operation check mode
9-6-1. Hydro unit
9-6-2. Outdoor unit
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.
Non-defective program operations for the
protection of the heat pump unit.
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.
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.
How to determine the presence of any
defect particularly in functional parts.
71
Remark
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