Daikin CTX Series Service Manual page 68

DAMA-SM-21-003
Troubleshooting
Reference
Check No.11 Refer to P.86
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
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.
YES
Is there any wiring error?
NO
Check the voltage of the
connection wires on the indoor
terminal strip between No. 1
wire no.3/SIG, and between No. 2
wire no.3/SIG.
NO
Properly insulated?
YES
Check the LED A on the outdoor
unit PCB.
Continuously ON or OFF
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.
NO
Is there any disturbance?
YES
NO
NO
Troubleshooting
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.
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