Compressor Overcurrent - Daikin VRV S RXQ4/5ARV1 Service Manual

SiAF332111E

5.45 Compressor Overcurrent

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