Transmission Error Between Outdoor Unit And Branch Provider (Bp) Unit - Daikin RMXS-L Series Service Manual

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