Daikin VRV III RXYQ5-54PY1 Service Manual page 289

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Power ON
Power OFF
278
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check for
power supply voltage.
Voltage between phases:
380 to 415V Phase
voltage: 220
to 240V
YES
Unbalanced
power supply? (Not more
than 2%: Phase voltage of
not more than
approx. 5V)
YES
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
NO
The
insulation resistance is
low (i.e., not more than
100kΩ.)
NO
Disconnect the cable from the
fan, and then check the fan
motor for the insulation
resistance.
NO
The
insulation resistance is
low (i.e., not more than
1MΩ.)
NO
Check the inverter power
transistor.
Has the
power transistor
got faulty?
NO
Check the fan driver power
transistor.
Has the
power transistor
got faulty?
NO
A
NO
NO
YES
YES
YES
YES
Si34-601A
On-site causes.
Make proper wire connections
without open phase, erroneous
connections, or erroneous order of
phases.
On-site causes
Correct the unbalanced loads to
eliminate the unbalanced state.
Unbalanced voltage will cause
extremely unbalanced current,
thus impairing the service life of or
resulting in the malfunction of the
equipment.
Replace the compressor.
Replace the fan motor.
Replace the fan driver.
Replace the inverter PC board.
Observe the conditions of the
PC board.
In the case of a serious failure, a
compressor failure may cause
the failure of the PC board. Even
if the PC board is replaced, it
may cause failure again.
To avoid that, recheck the
compressor for ground and for
any broken wires. Furthermore,
even after the completion of PC
board replacement, check the
compressor.
Replace the fan driver PC board.
Observe the conditions of the
PC board.
Troubleshooting