SiUS181631EA Troubleshooting for Outdoor Unit
Troubleshooting 261
7.31 System is not Set yet
Error Code
UF
Method of Error
Detection
On check operation, the number of indoor units in terms of transmission is not corresponding to that
of indoor units that have made changes in temperature.
Error Decision
Conditions
The malfunction is determined as soon as the abnormality aforementioned is detected through
checking the system for any erroneous connection of units on the check operation.
Supposed
Causes
îš„
Improper connection of transmission wiring between indoor unit - outdoor unit
îš„
Failure to execute check operation
îš„
Defective indoor unit PCB
îš„
Stop valve is left closed
Troubleshooting
Note: Wiring check 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 the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the indoor unit PCB
(control PCB).
Wiring check operation may
not have been carried out
successfully.
After fixing incorrect wiring,
push and hold the RESET
button (BS5) on the service
PCB (A2P) for 5 seconds.
∗ The unit does not run for up
to 12 minutes.
After fixing incorrect wiring,
push and hold the RESET
button (BS5) on the service
PCB (A2P) for 5 seconds.
∗ The unit does not run for up
to 12 minutes.
YES
NO
YES
NO
NO
YES
Open the stop valve (s).
YES
NO
Are the stop
valves opened?
Is the
check operation
carried out?
Is the
transmission wiring
normal?
Is the transmission
wiring normal?
(R22107)
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