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.
Summary of Contents for VRV S RXQ4/5ARV1
Page 1: ...Service Manual Cooling Only 50 60 Hz RXQ4 5ARV1 RXMQ6ARV1 RXMQ8 10 12ARY1 SiAF332111E...
Page 369: ...SiAF332111E Wiring Diagrams Part 7 Appendix 363 RXMQ6ARV1 C 3D137051...
Page 370: ...Wiring Diagrams SiAF332111E 364 Part 7 Appendix RXMQ8ARY1 C 3D137060...
Page 371: ...SiAF332111E Wiring Diagrams Part 7 Appendix 365 RXMQ10 12ARY1 3D121610B...
Page 375: ...SiAF332111E Wiring Diagrams Part 7 Appendix 369 FXMQ40 50 63 80 100ARV1 3D127112 04 59...