Transmission Error Between Outdoor Unit And Bp Unit - Daikin E-Series Service Manual

SiAU18-715
6.5

Transmission Error between Outdoor Unit and BP Unit

UJ
Outdoor Unit
Indication
Method of Transmission error is detected when the outdoor unit could not received the data from BP unit
correctly.
Malfunction
Detection
Malfunction When the data from BP unit could not be correctly received continuously for 10 minutes
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.14
Refer to P.356
Troubleshooting
Incorrect connection of transmission wire
Faulty outdoor unit power supply
Faulty BP unit PCB
Faulty outdoor unit PCB
Distortion of power supply wave
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn the power supply off.
Check the transmission wire
between outdoor unit - BP
unit
Is it normal?
YES
Turn the power supply back
on.
Is HAP on
the outdoor unit PCB
blinking?
YES
Is UJ displayed?
NO
Check No. 14
Check the power supply
waveform.
Is it deformed?
NO
NO
NO
YES
YES
Troubleshooting for BP Unit
Check the transmission
wire and the connection
orders.
Replace outdoor unit
control PCB.
Could be outside causes
other than errors.
Probe where the noise
comes from, and apply
remedy required.
Probe the causes for
deformation of power
supply waveform and apply
remedy required.
Replace outdoor unit
control PCB.
(Q0549)
355