Daikin VRV RXYMQ-A Series Service Manual page 241

SiME332106E
Troubleshooting
Note(s)
1. Make measurement of voltage at the power supply terminal block (X1M).
2. Make measurement of voltage at the L1, L2 and L3 terminals of diode module located on
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is supply
voltage imbalance over
approximately 12 V?
( 1)
NO
Is the imbalance of
voltage applied to the inverter
over approximately
12 V? ( 2)
NO
Even though the power
supply voltage is normal, the
error recurs.
Use the document "Notice of Inspection Results" attached to spare part.
Explanation to users
Hand the "Notice of Inspection Results" to user to ask
him/her to rectify the imbalance.
the inverter PCB during the compressor is in operation.
YES
Open phase?
NO
YES
<If voltage can be monitored>
Use equipment capable of constantly
recording power supply voltages (e.g.
Memory Hi-Corder) to record power
supply voltages between phases
(R-S, S-T, and R-T) for a period of
consecutive 1 week.
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).
Take countermeasures.
Be sure to explain user that "power supply
voltage imbalance" will occur and Daikin
accepts no responsibility for the imbalance.
Troubleshooting by Error Code
YES
Correct the open phase of
power supply.
Rectify the power supply
voltage imbalance.
Take countermeasures (listed
below).
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).
235