Daikin SUPER MULTI NX G Series, Service Manual

Page: 151 / 244

SiUS12-928_A Troubleshooting
Service Diagnosis 142
Troubleshooting
Check No.07
Refer to P.153
Check No.08
Refer to P.154
Check No.13
Refer to P.156
(R11900)
Caution
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
YES
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
∗
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. 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
again and start operation.
Turn off the power and turn it on
again to start the system. See if the
same error occurs.
Check the supply voltage.
Keep on using as it is.
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 SPM or the
PM1.
(Replace the outdoor unit
PCB.)
Replace the SPM or 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
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.