Daikin VRV II RXYQ5MATL, Service Manual

Page: 243 / 331

Troubleshooting by Indication on the Remote Controller Si39-504
232 Troubleshooting
3.52
“
UH
”
Malfunction of System, Refrigerant System Address
Undefined
Remote
Controller
Display
UH
Applicable
Models All models of indoor units
RXYQ5MA~48MA
Method of
Malfunction
Detection Detect an indoor unit with no address setting.
Malfunction
Decision
Conditions The malfunction decision is made as soon as the abnormality aforementioned is detected.
Supposed
Causes
„
Improper connection of transmission wiring between indoor-outdoor units and outdoor-
outdoor units
„
Defect of indoor unit PC board
„
Defect of outdoor unit PC board (A1P)
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2831)
NO
YES
YES
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Normal
NO
Is
electricity
being introduce for
the first time after
installation or after an indoor
or outdoor unit PC
board 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 indoor unit PC board.
Replace outdoor unit PC
board (A1P).
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds
∗
The unit will not run for up to
12 minutes.