Daikin VKM50GAV1, Service Manual

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Troubleshooting Si71-812
72 Troubleshooting
2.17
“
UA
”
Excessive Number of Indoor Units
Remote
Controller
Display
UA
Applicable
Models All models of indoor unit
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
„
Excess of connected indoor units
„
Defect of outdoor unit PC board (A1P)
„
Mismatching of the refrigerant type of indoor and outdoor unit.
„
Setting of outdoor PC board was not conducted after replacing to spare parts PC board.
Troubleshooting
∗
The number of indoor units that can be connected to a single outdoor unit system depends on
the type of outdoor unit.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2827)
The total
of indoor units
displaying "
UA
" and
indoor units connected to the
same refrigerant system is
within connectable
number of
unit
∗
Normal
NO
NO
There are too many indoor units
within the same refrigerant
system.
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds.
YES
Is the outdoor
PC board replaced
to spare parts PC
board ?
YES
The refrigerant classification has
not been set yet. Please set as per
VRV Service Manual.
NO
YES
Does a malfunction occur?
Replace outdoor unit PC board
(A1P).
Matches the refrigerant type of
indoor and outdoor unit.
NO
YES
Does the
refrigerant type of indoor
and outdoor unit
match?