Troubleshooting for Branch Provider (BP) Unit SiUS181631EA
224 Troubleshooting
6.5 Transmission Error between Outdoor Unit and Branch
Provider (BP) Unit
Error Code
UJ
Method of Error
Detection
Transmission error is detected when the outdoor unit could not received the data from BP unit
correctly.
Error Decision
Conditions
When the data from BP unit could not be correctly received continuously for 10 minutes
Supposed
Causes
îš„
Incorrect connection of transmission wire
îš„
Faulty outdoor unit power supply
îš„
Defective BP unit PCB
îš„
Defective outdoor unit PCB
îš„
Distortion of power supply waveform
Troubleshooting
Check No.11
Refer to P.225
YES
NO
Blink
Check No. 11
Check the power supply
waveform.
NO
YES
(R22094)
YES
NO
Check the transmission wire
and the connection orders.
Could be other causes than
malfunction.
Probe where the noise comes
from, and apply remedy
required.
Replace the main PCB (A1P)
of the outdoor unit.
Probe the causes for
deformation of power supply
waveform and apply remedy
required.
Turn the power supply back
on.
Normal?
Is UJ displayed again?
Continuously ON or OFF
Replace the main PCB (A1P)
of the outdoor unit.
Is HAP on the
outdoor unit PCB
blinking?
Turn the power supply off.
Check the transmission wire
between outdoor unit - BP
unit
Is there any
disturbance?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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