Daikin B-Series Service Manual page 149

Troubleshooting
Troubleshooting
Check No.07
∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and
Refer to P.145
Check No.08
Refer to P.146
Check No.13
Refer to P.148
138
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
reconnected for part replacement, for example, and the system is interrupted by an output over-current,
check the wires again.
Stop valve fully open?
YES
Turn off the power and turn it on
again to get the system started.
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 get restarted.
Check the supply voltage.
Voltage as rated?
YES
Short-circuit or
breakage between
compressor's coil
phases?
NO
Check No. 08
Check the discharge pressure.
Check No. 07
Check the installation condition.
NO
NO
Monitor the supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
Instantaneous supply voltage
drop
Compressor motor overloaded
Contact-induced electrical short-
circuit
YES
NO
NO
YES
Si04-306E
Fully open the stop valve.
Keep on using as it is
(monitor).
Check the electricals'
connectors and other
fittings.
∗ Inverter checker
Part No.: 1225477
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
Replace the SPM.
(Replace the outdoor unit
PCB.)
Correct the power supply.
Replace the compressor.
(R7270)
Service Diagnosis