Daikin VRV S RXQ4/5ARV1 - Compressor Overcurrent

SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 275
Note(s)
Reference
5.45 Compressor Overcurrent
5.45.1 Compressor Overcurrent (4/5/10/12 HP Models)
Applicable
Models
RXQ4/5AR, RXMQ10/12AR
Error Code L8
Method of Error
Detection
Error is detected by current flowing in the power transistor.
Error Decision
Conditions
Overload in the compressor is detected.
Supposed
Causes
 Compressor overload
 Broken wire inside compressor
 Defective outdoor unit main PCB (4/5 HP)
 Defective inverter PCB (10/12 HP)
 Disconnection of compressor
Troubleshooting
1. RXQ4/5AR: outdoor unit main PCB (A1P)
RXMQ10/12AR: inverter PCB (A3P)
CHECK 4 Refer to page 340.
NO
YES
YES
NO
Check if the
compressor lead wires are
normal.
Insulation
resistance of the
compressor is 100 k
or below.
YES
NO
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Connect the compressor lead
wires then restart the operation.
CHECK 4
Check if the power transistor
is normal.
YES
Replace the compressor
lead wires.
Replace the compressor
(M1C).
Replace the compressor
(M1C).
Replace the PCB (
1).
NO
YES
Error code L8 is
displayed again.
Continue the operation.
Inspection of the
compressor (M1C).
The internal
wiring of the
compressor coil is
defective.