Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 142
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
NO
YES
YES
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit P.C.B. for 5 seconds.
Normal
NO
Is
electricity
being introduce for
the first time after
installation after an indoor
or outdoor unit P.C.B.
has been
replaced?
Is
indoor - outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
Normal
NO
Does a malfunction
occur?
NO
Does
a "
UH" malfunction occur
for all indoor units in
the system?
YES
NO
Does
a malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to indoor
and outdoor
units?
YES
Replace the indoor unit P.C.B.
Replace the outdoor unit
P.C.B. (A1P).
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
P.C.B. for 5 seconds
* The unit will not run for up to
12 minutes.