Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 291
3.3.28 Transmission Error between Outdoor Unit and BP Unit
Outdoor Unit
Indication
U4
Method of
Malfunction
Detection
Transmission error is detected when the data from BP unit could not be correctly received.
Malfunction
Decision
Conditions
When the data from BP unit could not be correctly received continuously for 15 seconds
Supposed
Causes
"
Incorrect connection of transmission wire
"
Connection from Side-A of BP is not carried out.
"
BP determined numbers are different from actual BP numbers.
"
Distortion of power supply wave
Troubleshooting
Turn the power supply off.
YES
Check the transmission
wire and the connection
orders.
Replace filter PC board.
Is it normal?
(MF047)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check the transmission wire
between outdoor unit - BP
unit
Is filter PC board normal?
NO
Turn the power supply back
on.
YES
Are the
connection BP numbers
lit on after displaying
888?
NO (blinking)
YES
Set the numbers again.
Turn the power supply on
again.
Display mode completed
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