Specifications

SiUS12-928_A Troubleshooting
Service Diagnosis 120
Troubleshooting
Check No.07
Refer to P.153
Check No.08
Refer to P.154
Check No.14
Refer to P.157
(R11896)
Caution
∗ An input overcurrent may result from wrong internal wiring. If the wires have been disconnected and
reconnected, and the system is interrupted by an input overcurrent, take the following procedure.
NO
YES
NO
YES
YES
NO
Start operation and measure the
input current.
Check No. 14
Check the main circuit electrolytic
capacitor.
Check No. 08
Check the discharge pressure.
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
again and start operation.
Replace the outdoor unit
PCB.
Replace the electrolytic
capacitor.
Correct the power supply or
replace the SPM or PM1.
(Replace the outdoor unit
PCB.)
Normal?
Any LED off?
Input current flowing
above its stop level?
∗ Inverter checker
Part No.: 1225477
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.