SiMX042215E
Troubleshooting
Part 6 Service Diagnosis
87
4.24 Output Overcurrent Detection
Error Code
L5
Method of Error
Detection
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Error Decision
Conditions
A position signal error occurs while the compressor is running.
A rotation speed error occurs while the compressor is running.
An output overcurrent signal is fed from the output overcurrent detection circuit to the
microcomputer.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
Poor installation condition
Closed stop valve
Defective power module
Wrong internal wiring
Abnormal power supply voltage
Defective outdoor unit PCB
Power supply voltage out of specification
Defective compressor
Troubleshooting
(R24911)
Caution
N
O
YES
N
O
YES
∗
An o
u
tp
u
t o
v
erc
u
rrent may res
u
lt from
w
rong internal
w
iring. If the system is interr
u
pted
b
y an o
u
tp
u
t
o
v
erc
u
rrent after the
w
ires ha
v
e
b
een disconnected and reconnected for part replacement, check the
w
iring again.
Check No. 17
Check No.15
T
u
rn off the po
w
er and disconnect
the harnesses U, V, and
W
.
T
u
rn off the po
w
er. Then, t
u
rn on
the po
w
er to restart the system.
See if the same error occ
u
rs.
Monitor the po
w
er s
u
pply
v
oltage,
discharge and s
u
ction press
u
res,
and other factors for a long term.
Possi
b
le ca
u
ses
∗
Momentary drop of po
w
er s
u
pply
v
oltage
∗
Compressor o
v
erload
∗
Short circ
u
it
Check the installation condition.
Check
w
ith the in
v
erter analyzer.
N
ot a malf
u
nction.
Keep o
b
ser
v
ing.
Check the connectors and
other components.
F
u
lly open the stop
v
al
v
e.
Error again?
Stop
v
al
v
e f
u
lly open?
∗
In
v
erter analyzer:
RSUK0917C
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
A
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