Daikin 4MXL-T Series Service Manual page 181

SiUS121827E
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the power supply voltage.
Is the
voltage fluctuation
within ±10% from the rated
value?
YES
Check the connection wires
between the indoor unit and the
outdoor unit.
Is there any
wiring error?
NO
Check the voltage of the
connection wires on the indoor
terminal strip/block between
No. 1 and No. 3, and between
No. 2 and No. 3.
Properly
insulated?
YES
Check the LED A on the outdoor
unit PCB.
Is LED A
blinking?
Blink
Rotate the
outdoor fan manually.
Does the outdoor fan rotate
smoothly?
YES
Check No.11
Check the power supply
waveform.
Is there any
disturbance?
YES
NO
YES
NO
Continuously ON or OFF
NO
NO
Troubleshooting for RA Indoor Unit
Correct the power supply.
Correct the connection wires
between the indoor unit and
the outdoor unit.
Replace the connection wires
between the indoor unit and
outdoor unit.
Replace the outdoor unit PCB
(main PCB).
Replace the outdoor fan motor
and the outdoor unit PCB
(main PCB).
Replace the indoor unit PCB
(control PCB).
Locate and eliminate the
cause of the disturbance of
the power supply waveform.
(R24621)
175