System Abnormality, Refrigerant System Address Undefined - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit
7.32 System Abnormality, Refrigerant System Address
Undefined
UH
Error Code
Method of Error The system detects an indoor unit to which auto address has not been assigned.
Detection
Error Decision
The malfunction decision is made as soon as the abnormality is detected.
Conditions
 Improper connection of transmission wiring between indoor and outdoor unit
Supposed
 Defective indoor unit PCB
Causes
 Defective main PCB (A1P)
Troubleshooting
installation or after an indoor
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PCB for 5 seconds.
219
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the
electricity
being introduce for
the first time after
YES
or outdoor unit PCB
has been
replaced?
NO
Is the
NO
indoor unit - outdoor unit
transmission wiring
normal?
YES
NO
Does a malfunction
occur?
YES
Does
NO
UH
a malfunction occur
for all indoor units in
the system?
YES
Does
a malfunction
occur even after 12
minutes elapses from the
NO
time when electricity is
introduced to indoor
unit and outdoor
unit?
YES
SiUS181305E
Normal
After fixing incorrect wiring,
push and hold the RESET
button (BS5) on the service
PCB (A2P) for 5 seconds.
∗ The unit does not run for up
to 12 minutes.
Normal
Replace the indoor unit PCB.
Replace the main PCB (A1P).
(R15644)
Troubleshooting