Service Manual

SiUS121502E Troubleshooting for Outdoor Unit
Service Diagnosis 165
Troubleshooting
Check No.15
Refer to P.171
Check No.17
Refer to P.173
Check No.18
Refer to P.173
Check No.22
Refer to P.176
(R21438)
Caution
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 22
Check No. 17
Check No.15
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.
Turn off the power. Then, turn on
the power to restart the system.
See if the same error occurs.
Check the power supply voltage.
Monitor the power supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
∗ Momentary drop of power supply
voltage
∗ Compressor overload
∗ Short circuit
Check the installation condition.
Check with the inverter analyzer.
Check the power module.
Not a malfunction.
Keep observing.
Check the connectors and
other components.
Fully open the stop valve.
Correct the power supply.
Replace the compressor.
Correct the power supply
or replace the outdoor unit
PCB (main PCB).
Replace the outdoor unit
PCB (main PCB).
Error again?
Stop valve fully open?
Voltage as rated?
Any LED off?
Normal?
∗ Inverter analyzer:
RSUK0917C
Short circuit or
wire breakage between
compressor's coil
phases?
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the discharge
pressure.
Go to Check No. 18.