Excessive Number Of Indoor Units - Daikin RMXS-L Series Service Manual

SiUS181631EA

7.28 Excessive Number of Indoor Units

UA
Error Code
Method of Error
Detection
Error Decision The malfunction decision is made as soon as either of the abnormalities is detected.
Conditions
Supposed
Causes
Troubleshooting
indoor units connected to the
Push and hold the RESET
button (BS5) on the service
PCB (A2P) for 5 seconds.
Troubleshooting
A difference occurs in data by the type of refrigerant between indoor and outdoor units.
The number of indoor units is out of the allowable range.
Incorrect signals are transmitted among the indoor unit, BP unit, and outdoor unit.
Excess of connected indoor units
Defective main PCB (A1P)
Mismatching of the refrigerant type of indoor and outdoor unit.
Setting of outdoor unit PCB was not conducted after replacing to spare parts PCB.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the
outdoor unit PCB
YES
replaced to spare parts
PCB?
NO
The
total
number of
indoor units
UA
displaying and
NO
same refrigerant system
is within
connectable
number of
unit?
YES
Does a
NO
malfunction occur?
YES
Does the
NO
refrigerant type of
indoor and outdoor
unit match?
YES
Troubleshooting for Outdoor Unit
The refrigerant
classification has not been
set yet.
There are too many indoor
units within the same
refrigerant system.
Normal
Match the refrigerant type
of indoor and outdoor unit.
Replace the main PCB
(A1P).
(R15591)
257