Daikin VRV III-S RXYMQ36 48PVJU Service Manual page 185

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting the connector, or parts may be damaged.
power supply voltage.
Voltage between phases: 380 to
415V Phase voltage: 220
Power ON
power supply? (Not more
than 2%: Phase voltage of not
Disconnect the cable from the
compressor, and then check the
compressor for the insulation
resistance.
resistance is low (i.e., not more
Disconnect the cable from the fan,
and then check the fan motor for the
insulation resistance.
insulation resistance is
low (i.e., not more than
Power OFF
Check the inverter power transistor.
176
Check for
NO
to 240V
YES
Unbalanced
NO
more than approx.
5V)
YES
The insulation
YES
than 100kW.)
NO
The
YES
1MW.)
NO
Is the power
YES
transistor failing?
NO
A
Onsite causes.
Make proper wire connections
without open phase, erroneous
connections, or erroneous order
of phases.
Onsite 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 main PCB (A1P).
Observe the conditions of the
PCB.
In the case of a serious
failure, a compressor failure
may cause the failure of the
PCB. Even if the PCB is
replaced, it may cause failure
again.
To avoid that, recheck the
compressor for ground and for
any broken wires.
NOTE: Even after the
completion of PCB
replacement, check the
compressor.
Troubleshooting
SiUS34-907