Trouble shooting
Si04-115
78
Service Diagnosis
Troubleshooting
∗
Erroneous internal wiring can result in output overcurrent in some cases. If system stops due
to output overcurrent after parts replacement that requires disconnection of wires, check
wiring carefully
Check No.3
Refer to P.85
Check No.4
Refer to P.87
Check No.12
Refer to P.90
Check No.6
Refer to P.89
Turn off power, and turn it on
again. Then, check if error is
generated again.
NO
NO
NO
Is error generated again?
Is power transistor normal?
Supply voltage check.
Monitor supply voltage,
discharge/sunction pressures, etc.
for an extended period of time.
Possible causes
n
Momentary supply voltage drop
n
Excessive load on compressor
motor
n
Shorting in electric circuit due to
contact
Is stop valve fully open?
NO
Are outputs
of phases U, V and W
balanced?
NO
Is supply voltage at
related value?
YES
Mechanical
locking of compressor,
shorting of coil phases,
wire breakage?
Check No.3
Power transistor check.
Check No. 4
Power transistor output check.
Check No.12
Discharge pressure check.
Check No.6
Installation condition check.
YES
YES
YES
NO
YES
YES
Fully open stop valve.
Can be used as is.
Check connectors of electric
components.
Replace power transistor.
Replace outdoor unit PCB.
Correct power supply.
Replace compressor.
(R1956)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
