Daikin VRV III REYQ8PY1, Service Manual

Page: 319 / 452

Troubleshooting by Indication on the Remote Controller Si37-701
308 Troubleshooting
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Power ON
Power OFF
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.
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Check for
power supply voltage.
Voltage between phases:
380 to 415V Phase
voltage: 220
to 240V
Unbalanced
power supply? (Not more
than 2%: Phase voltage of not
more than approx.
5V)
The
insulation resistance is
low (i.e., not more than
100k
Ω
.)
The
insulation resistance is
low (i.e., not more than
1M
Ω
.)
Has the
power transistor got
faulty?
Has the
power transistor got
faulty?
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
Disconnect the cable from the
fan, and then check the fan
motor for the insulation
resistance.
Check the inverter power
transistor.
Check the fan driver power
transistor.
A