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
Detection correctly.
Error Decision
When the data from BP unit could not be correctly received continuously for 10 minutes
Conditions
 Incorrect connection of transmission wire
Supposed
 Faulty outdoor unit power supply
Causes
 Defective BP unit PCB
 Defective outdoor unit PCB
 Distortion of power supply waveform
Troubleshooting
Check No.11
Refer to P.182
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.
181
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
NO
Is it normal?
YES
Is HAP on the NO
outdoor unit PCB
blinking?
YES
YES
Is UJ displayed again?
NO
YES
Is it deformed?
NO
SiUS181305E
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.
Probe the causes for
deformation of power supply
waveform and apply remedy
required.
Replace the main PCB (A1P)
of the outdoor unit.
(R15586)
Troubleshooting