Daikin SUPER MULTI NX G Series Service Manual page 151

SiUS12-928_A
Troubleshooting
Check No.07
Refer to P.153
Check No.08
Refer to P.154
Check No.13
Refer to P.156
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
∗ An output overcurrent signal may result from wrong internal wiring. If the wires have been
disconnected and reconnected and the system is interrupted by an output overcurrent, take the
following procedure.
Check No. 07
Check the installation condition.
Stop valve fully open?
YES
Turn off the power and turn it on
again to start the system. See if the
same error occurs.
Error again?
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check with the inverter checker (∗).
Any LED off?
NO
Check No. 13
Check the power transistor.
Normal?
YES
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check the supply voltage.
Voltage as rated?
YES
Short circuit or
wire breakage between
compressor's coil
phases?
NO
Check No. 08
Check the discharge pressure.
NO
NO
Monitor the supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
∗ Instantaneous supply voltage
drop
∗ Compressor overloaded
∗ Contact-induced electrical short
circuit
∗ Inverter checker
Part No.: 1225477
YES
NO
NO
YES
Troubleshooting
Fully open the stop valve.
Keep on using as it is.
Check the connectors and
other components.
Correct the power supply or
replace the SPM or the
PM1.
(Replace the outdoor unit
PCB.)
Replace the SPM or the
PM1.
(Replace the outdoor unit
PCB.)
Correct the power supply.
Replace the compressor.
(R11900)
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