Failure Diagnosis For Inverter System - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 159 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 impossible
Malfunction
Troubleshooting Inverter K Series
: Failure is probable
: Failure is possible
: Failure is improbable
Contents of Inverter
code malfunction
PC board Other
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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Field
Point of diagnosis
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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