SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 421
7.33 System is not Set yet
Remote
Controller
Display
UF
Method of
Malfunction
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.
Malfunction
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.
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.
YES
NO
YES
NO
NO
YES
Open stop valve.
YES
NO
Are the stop
valves opened?
Is the
check operation
carried out?
Is the
indoor unit - outdoor
unit transmission wiring
normal?
Is the indoor unit
- outdoor unit transmission
wiring normal?
(R13053)
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