SiBE18-821_C Troubleshooting for BP Unit
Troubleshooting 381
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
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.14
Refer to P.382
YES
NO
YES
Check No. 14
Check the power supply
waveform.
NO
YES
(R13015)
NO
YES
Check the transmission wire
and the connection orders.
Could be external factor other
than errors.
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.
Is it deformed?
Turn the power supply back
on.
Is it normal?
Is "UJ" displayed again?
NO
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
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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