Troubleshooting for Outdoor Unit Si18-525B
394 Troubleshooting
7.27 Refrigerant System not Set, Incompatible Wiring/Piping
Remote
Controller
Display
UF
Applicable
Models
AII BP unit models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Failure to execute wiring check operation
Defect of BP unit PCB
Failure to open the stop valve
Troubleshooting
Note: Test operation may not be successful if carried out after the outdoor unit has been off for more
than 12 hours, or if it is not carried out after running all connected indoor units in the fan mode
for at least an hour.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(Q0388)
Replace the BP unit PCB.
Is the
electronic
expansion valve coil
disconnected?
Retry to test operation
Is "UF" displayed again?
Test operation may not have
been carried out successfully.
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PCB for 5 seconds.
Correct the electronic
expansion coil.
NO
YES
NO
YES
Is Indoor-BP
and BP-outdoor unit
transmission wiring
normal?
Open stop valve.
YES
NO
Are the stop
Valves opened?
∗ The unit will not run for up to
12 minutes.
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