Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 320 / 419

Troubleshooting by Error Code SiUS342004EB
313 Part 6 Service Diagnosis
3.52 Compressor Overcurrent
Applicable
Models
All outdoor unit models
Error Code
L8
Method of Error
Detection
Detect current flowing through the power transistor.
Error Decision
Conditions
When the secondary-side inverter current exceeds.
Supposed
Causes

Compressor overloaded

Wiring disconnection in compressor coil

Disconnection of compressor wiring

Defective inverter PCB

Incorrect power supply voltage
Troubleshooting
Power OFF
Open the stop v al v e.
YES
NO
Is the stop v al v e open?
YES
YES
Are
wiring and wire
connections to the rele v ant
compressor
normal?
Rectify the wiring and
wire connections.
NO
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.
Are the
leads of the rele v ant
compressor
normal?
Replace the leads of the
rele
v ant compressor.
NO
A
Check the compressor ca b le
for disconnection and flaws.
NO
The
ins u lation
resistance of the
rele v ant compressor is
100 k
Ω
or less to
gro u nd.
Replace the
compressor.
YES
The
internal wiring of
the compressor coil is
defecti v e.
Replace the
compressor.
YES
NO
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