Troubleshooting for Outdoor Unit SiBE18-821_C
422 Troubleshooting
7.34 System Abnormality, Refrigerant System Address
Undefined
Remote
Controller
Display
UH
Method of
Malfunction
Detection
The system detects an indoor unit to which auto address has not been assigned.
Malfunction
Decision
Conditions
The malfunction decision is made as soon as the abnormality is detected.
Supposed
Causes
îš„
Improper connection of transmission wiring between indoor and outdoor unit
îš„
Defective indoor unit PCB
îš„
Defective main PCB (A1P)
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
YES
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.
Normal
NO
YES
Normal
NO
Does a malfunction occur?
NO
YES
NO
YES
Replace the indoor unit PCB.
Replace the main PCB (A1P).
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PCB for 5 seconds.
Is the
electricity
being introduce for
the first time after
installation or after an indoor
or outdoor unit PCB
has been
replaced?
Does
a malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to indoor
unit and outdoor
unit?
Is the
indoor unit - outdoor unit
transmission wiring
normal?
Does
a "
UH" malfunction occur
for all indoor units in
the system?
(R13054)
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