Troubleshooting for BP Unit Si18-525B
364 Troubleshooting
6.5 Transmission Error between Outdoor Unit and BP Unit
Outdoor Unit
Indication
UJ
Method of
Malfunction
Detection
Transmission error is detected when the outdoor unit could not received the data from BP unit
correctly.
Malfunction
Decision
Conditions
When the data from BP unit could not be correctly received continuously for 10 minutes
Supposed
Causes
Incorrect connection of transmission wire
Faulty outdoor unit power supply
Faulty BP unit PCB
Faulty outdoor unit PCB
Distortion of power supply wave
Troubleshooting
Check No.14
Refer to P.365
Turn the power supply off.
YES
Check the transmission
wire and the connection
orders.
Replace outdoor unit
control PCB.
Is it normal?
NO
Check the transmission wire
between outdoor unit - BP
unit
Is HAP
on the outdoor unit PCB
blinking?
NO
Turn the power supply back
on.
YES
NO
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.
(Q0394)
YES
Check No. 14
Check the power supply
waveform.
Is UJ displayed?
NO
Is it deformed?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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