SiUS04-924 Troubleshooting
Service Diagnosis 101
Troubleshooting
Check No.07
Refer to P.109
Check No.08
Refer to P.109
Check No.13
Refer to P.111
(R8071)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
Monitor the supply voltage,
discharge and suction pressures,
and other factors long term.
Possible causes
Instantaneous supply voltage
drop
Compressor motor overloaded
Contact-induced electrical
short-circuit
* An output overcurrent may result from wrong internal wiring. If the wires have been disconnected and
reconnected for parts replacements, for example, and the system is interrupted by an output overcurrent,
take the following procedure:
Check No. 08
Check the discharge pressure.
Check No. 13
Check the power transistor.
Check No. 07
Check the installation condition.
Check with the inverter checker (*).
Turn off the power and disconnect
the harnesses U, V and W.
Turn off the power, and reconnect
the harnesses. Turn on the power
Turn off the power and turn it on
again to get the system started.
Check the supply voltage.
Keep on using as is
(monitor).
Check the electricals'
connectors and other
fittings.
Fully open the stop valve.
Correct the power supply.
Replace the compressor.
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
Replace the PM1.
(Replace the outdoor unit
PCB.)
Normal?
Error again?
Stop valve fully open?
Voltage as rated?
Any LED off?
* Inverter checker
Part No.: 1225477
Short-circuit
or breakage between
compressor's coil phases?
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