System Abnormality, Refrigerant System Address Undefined - Daikin SkyAir RZR-TA Series Service Manual

SiUS281811EA
4.59 System Abnormality, Refrigerant System Address
Undefined
UH
Error Code
Applicable All indoor units
Models All outdoor units
Method of Error System detects an indoor unit whose address is not defined by automatic address function.
∗Automatic address refers to the automatic designated address of indoor unit and outdoor unit
Detection
when connected to the power after installation or wiring replacement (with the RESET (BS5)
button pressed for more than 5 seconds).
Error Decision
The error decision is made as soon as the abnormality aforementioned is detected.
Conditions
Supposed  Improper connection of transmission wiring between indoor-outdoor units
Causes  Defective indoor unit PCB
 Defective outdoor unit main PCB (A1P)
Troubleshooting
Note(s)
∗1. Refer to installation manual for correct "indoor unit and outdoor unit connection wiring".
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is
electricity
being introduced
for the first time after
YES
installation or after an indoor
or outdoor unit main
PCB has been
replaced?
NO
Is indoor-outdoor unit
transmission wiring
normal? ( 1)
YES
Press and hold the RESET
(BS5) button on the outdoor
unit PCB for 5 seconds
Does a UH error
occur for all indoor
units in the system?
YES
Does
an error
occur even after
12 minutes elapses
from the time when
electricity is introduced
to indoor and
outdoor
units?
YES
NO
NO
Troubleshooting by Error Codes
NO
Normal.
After fixing incorrect wiring,
press and hold the RESET
(BS5) button on the outdoor
unit main PCB for 5 seconds.
The unit will not run for up to
12 minutes.
Replace the indoor unit PCB.
Replace the outdoor unit main
PCB (A1P).
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