Daikin ERQ - UA Excessive Number of Ahus

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 215
3.43 “UA” Excessive Number of AHUs
Remote
Controller
Display
UA
Applicable
Models
AII AHU models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
 Excess of connected AHUs
 Defect of outdoor unit PC board (A1P)
 Mismatching of the refrigerant type of AHU and outdoor unit.
 Setting of outdoor PC board was not conducted after replacing to spare parts PC board.
Troubleshooting
∗ The number of AHUs 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.
(V3169)
The total
of indoor units
displaying " 7) " and
indoor units connected to the
same refrigerant system is
within connectable
number of
unit∗
Normal
NO
NO
There are too many AHUs 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 outdoor PC board replaced is
wrong, check PC board type.
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 AHU and
outdoor unit
match?
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