Daikin E-Series Service Manual page 367

Troubleshooting for BP Unit
Troubleshooting
Check No.14
Refer to P.356
354
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Push and hold the RESET button on
the outdoor unit PCB for 5 seconds
Does the malfunction
occur again?
YES
Check the indoor unit-outdoor unit
connection wires.
Is there any wiring error?
NO
Is HAP blinking?
Check for
indoor unit
microcomputer
normal HAP
Check the outdoor unit's LED A.
Is LED A blinking?
YES
Check the voltage of the indoor
unit-outdoor unit connection wires
between No. 1 and No. 2, and
between No 2 and No. 3.
Is the voltage 0 V?
NO
Check No. 14
Check power supply waveform.
Is there any disturbance?
YES
NO
YES
NO (ON or OFF)
Turn the power supply off once
and then back on.
Is HAP blinking?
YES
NO
Turn power supply off, and turn
on again.
Is LED A blinking?
YES
YES
NO
SiAU18-715
Normal
(Address Setting was
not conducted)
Correct the indoor unit-
outdoor unit connection
wires.
NO
Faulty indoor unit PCB
or malfunction of power
supply system.
Resets normally.
Could result from
external cause
(e.g. noise).
NO
Faulty BP unit PCB or
malfunction of power
supply system.
Could result from
external cause
(e.g. noise).
Replace the connection
wires between the
indoor and outdoor
units.
Replace indoor unit
control PCB.
Locate the cause of the
disturbance of the power
supply waveform, and
correct it.
(Q0548)
Troubleshooting