Is supply
voltage imbalance over
certain value?
(1, 3)
Correct the open phase of
power supply.
Open phase?
Is the imbalance of
voltage applied to the inverter
over certain value?
(2, 3)
Rectify the power supply
voltage imbalance.
Take countermeasures (listed
below).
YES YES
NO
NO
NO
Take countermeasures.
Defective noise filter, inverter
PCB or wiring
Turn OFF the power supply,
and then check and repair
wirings in the main circuit and
defective components.
(1) Loose contact and wiring
disconnection between the
power supply and the
inverter
(2) Wiring disconnection in or
loose contact of noise filter
Replace the inverter PCB
(A3P).
YES
Explanation to users
Use the document “Notice of Inspection Results” attached to spare part.
Hand the “Notice of Inspection Results” to user to ask
him/her to rectify the imbalance.
Be sure to explain user that “power supply
voltage imbalance” will occur and Daikin
accepts no responsibility for the imbalance.
Record the power supply voltage
between the three phases (L1-L2,
L2-L3, L3-L1) continuously for about
one week using a memory recorder
that can constantly record the voltage.
Power supply voltage imbalance Even
though power supply voltage remains
balanced when making measurement,
it often becomes imbalanced during
nighttime (from 06:00 PM to 10:00 PM).
Even though the power
supply voltage is normal, the
error recurs.
<If voltage can be monitored>
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
the inverter PCB during the compressor is in operation.
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