Daikin RXSQ24TAVJU Service Manual page 237

SiUS331708EA
Troubleshooting
CHECK 3
CHECK 4
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the
power supply
voltage between L1 and L2,
L2 and L3, and L1 and L3 within
208 V –10% to 230 V
+10%?
YES
CHECK 4 Check the inverter power transistor.
Is the power transistor failing?
NO
CHECK 3
Is the resistance greater than
the standard?
YES
Measure voltage between + and - of
the electrolytic capacitor (C+, C-)
when the compressor is operating.
Is the
measured voltage greater or equal
to 220-240 VDC?
NO
Refer to page 259.
Refer to page 260.
NO
Calibrate the power voltage.
If L2 and Phase N are disconnected,
replace the distribution box.
YES
Replace the outdoor main PCB (A1P).
NO
Replace the fan motor.
YES
Monitor voltage.
(Instantaneous voltage drop)
Replace the outdoor main PCB
(A1P).
Troubleshooting by Error Code
Check the PCB condition.
In case of a serious failure,
compressor failure may lead to PCB
failure. Therefore, failure would recur
when replacing the PCB. To avoid
this situation, recheck whether the
compressor is grounded or whether
the wire is broken. Moreover, check
the compressor after replacing the
PCB.
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