Daikin REYQ8-48PY1B, Service Manual

Page: 355 / 477

SiBE37-701_B Troubleshooting by Indication on the Remote Controller
Troubleshooting 344
Troubleshooting
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 A3P
•
A3P X401A
⇔
X10A A4P
•
A1P X28A
⇔
X6A A4P
•
A4P X61A
⇔
X402A A3P
•
A4P X1A
⇔
X403A A3P
•
A4P P1, P2
⇔
Reactor terminal L1R
•
A4P P3, N3
⇔
P1, N1 A5P
•
A5P P2, N2
⇔
P1, N1 A7P
A
YES
Single : A5P, A8P
Multi
: A4P
Replace the inverter PCB.
∗
If the PCB replaced is badly
damaged, the compressor is
likely to get faulty. To make sure,
recheck the compressor.
<Multi>
Power OFF
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 A4P
•
A4P or A7P X401A
⇔
X10A A5P or A8P
•
A1P or A3P X28A
⇔
X6A A5P or A8P
•
A5P or A8P X61A
⇔
X402A A4P or A7P
•
A5P or A8P X1A
⇔
X403A A4P or A7P
•
A5P or A8P P1, P2
⇔
Reactor terminal L1R
•
A5P or A8P P3, N3
⇔
P1, N1 A6P
•
A6P P2, N2
⇔
P1, N1 A7P
<Single>
Has the inverter
PCB caused
damage?
Has the fan driver
caused damage?
Turn ON the power supply.
Stop (standby) before
the fan rotates.
Stop (standby) when
the compressor
starts up.
Power ON
The "
U2
"
malfunction recurs.
NO
YES
NO
YES
NO
YES
NO
YES
NO
Single : A6P, A7P or A9P
Multi
: A5P/A7P
Replace the fan driver PCB.
∗
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 A4P, A7P or
A3P noise filter PCB.
If the malfunction recurs, replace
the inverter PCB.
Recheck for the power supply. If
there is no problem with the power
supply, replace the A5P, A8P or
A4P inverter PCB.
∗
If the PCB 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.