Daikin VRV III RXYQ5-54PY1 Service Manual page 290

Si34-601A
Troubleshooting
Power OFF
Power ON
Troubleshooting
Troubleshooting by Indication on the Remote Controller
A
Check for connector connections: Remove
and insert the connectors shown below.
Furthermore, check the connectors for
terminal conditions and continuity.
• X1M power receiving terminal ⇔ X400A A2P
• A2P X401A ⇔ X10A A3P
• A1P X28A ⇔ X6A A3P
• A3P X61A ⇔ X402A A2P
• A3P X1A ⇔ X403A A2P
• A3P P1,P2 ⇔ Reactor terminal L1R
• A3P P3,N3 ⇔ P1,N1 A4P
• A4P P2,N2 ⇔ P1,N1 A8P
Has the
inverter PC board caused
damage?
NO
Has the
fan driver caused
damage?
NO
Turn ON the power supply.
Stop (standby)
before the fan rotates.
NO
Stop (standby)
when the compressor
starts up.
NO
The U2
malfunction recurs.
NO
YES
YES
YES
YES
YES
If any wiring has damage, replace
the harness.
A3P: Replace the inverter PC board.
∗If the PC board replaced is badly
damaged, the compressor is
likely to get faulty. To make sure,
recheck the compressor.
A4P/A8P: Replace the fan driver
PC board.
∗If the PCB replaced is badly
damaged, the fan motor is likely
to get faulty. To make sure,
recheck the compressor.
Recheck for the power supply. If
there is no problem with the power
supply, replace the A2P noise filter
PC board.
If the malfunction recurs, replace
the inverter PC board.
Recheck for the power supply. If
there is no problem with the power
supply, replace the A3P inverter
PC board.
∗If the PC board replaced is badly
damaged, compressor is likely to
get faulty. To make sure, recheck
the compressor.
Check the harness, and then
replace it if necessary.
End of measures:
The malfunction may temporarily
result from on-site causes.
Causes: Instantaneous power
failure (open phase), noises, or
else.
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