Uh" Malfunction Of System, Refrigerant System Address Undefined - Daikin VRV II RXYQ5MATL Service Manual

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