Daikin REYQ-AATJA, Service Manual, Page: 385 / 495

SiUS372201EA Troubleshooting by Error Code
Part 6 Service Diagnosis 378
3.57 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 a certain value.
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 valve.
YES
NO
Is the stop valve open?
YES
YES
Are
wiring and wire
connections to the relevant
compressor
normal?
Rectify the wiring and
wire connections.
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Are the
leads of the relevant
compressor
normal?
Replace the leads of the
relevant compressor.
NO
A
Check the compressor cable
for disconnection and flaws.
NO
The
insulation
resistance of the
relevant compressor is
100 k
Ω
or less to
ground.
Replace the
compressor.
YES
The
internal wiring of
the compressor coil is
defective.
Replace the
compressor.
YES
NO
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