Daikin VRV Inverter K Series Manual page 335

SI-05C.BOOK Page 321 Monday, November 6, 2000 4:13 PM
SiE-05C
4. Failure Diagnosis for Inverter System
4.1 Points of Diagnosis
The main causes for each malfunction code are given in the table below. (For details refer to the next page
and those following.
: Failure is probable
: Failure is possible
: Failure is improbable
— : Failure is impossible
Malfunction
Code
Troubleshooting PLUS Series
Contents of
Malfunction
Inverter
PC Other
Board
Power
Unit
L4 Radiator fin
temperature
rise
L5 Instantaneous —
over-current
L8 Electronic —
thermostat
L9 Stall —
prevention
LC Malfunction of
transmission
between
inverter PC
board and
outdoor unit
PC board
U2 Abnormal
current/
voltage
P1 Over-ripple
protection
P4 Defect of
radiator fin
temperature
sensor
Failure Diagnosis for Inverter System
Location of Failure
Compressor Refrigerant Outdoor Other
System
Unit PC
Board
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Point of Diagnosis
Field
Cause
Is the intake port of
the radiator fin
clogged?
— Inspect the
compressor.
— Inspection the
compressor and
refrigerant system.
— Inspection the
compressor and
refrigerant system.
— Inspect the
connection
between the
inverter PC board
and outdoor unit PC
board. Next, inspect
the inverter PC
board.
•Inspect the fuse on
the inverter PC
board.
•Check the DC
voltage.
•Open phase
•Current/voltage
imbalance
•Defect of main
circuit wiring"
— Inspect the radiator
fin thermistor.
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