Daikin VRVII Manual page 278

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Caution
Power ON
Disconnect the cable from
the compressor, and then
Power OFF
check the compressor for
the insulation resistance.
Disconnect the cable from
the fan, and then check
the fan motor for the
insulation resistance.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
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
The
insulation
resistance is low (i.e.,
not more than
100kΩ.)
NO
The
insulation
resistance is low (i.e.,
not more than
1MΩ.)
NO
A
NO
Onsite causes.
Make proper wire
connections
without open
phase, erroneous
connections, or
erroneous order
of phases.
NO
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
error of the
equipment.
YES
Replace the
compressor.
YES
Replace the fan
motor.
Replace the fan
driver.
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