Daikin VRV S RXQ4/5ARV1, Service Manual, Page: 332 / 377

Troubleshooting by Error Code SiAF332111E
326 Part 6 Service Diagnosis
Note(s)
5.68 System Abnormality, Refrigerant System Address
Undefined
Applicable
Models
All indoor unit models
All outdoor unit models
Error Code
UH
Method of Error
Detection
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
when connected to the power after installation or wiring replacement.
Error Decision
Conditions
The error decision is made as soon as the abnormality aforementioned is detected.
Supposed
Causes
 Improper connection of transmission wiring between indoor-outdoor units

Defective indoor unit PCB
 Defective outdoor unit main PCB
Troubleshooting

1. RXQ4/5AR: RESET (BS5)
RXMQ6-12AR: RETURN (BS3)
Is
electricity
being introduced
for the first time after
installation or after an indoor
or outdoor unit main
PCB has been
replaced?
Does
an error
occur even after
12 minutes elapses
from the time when electricity
is introduced to indoor
and outdoor units?
Does a UH
error occur for all
indoor units in the
system?
Is
indoor-outdoor unit
transmission
wiring normal?
NO
YES
YES
After fixing incorrect wiring,
press and hold the button (
1)
on the outdoor unit main PCB
for 5 seconds.
Normal
NO
YES
Normal
NO
Does an error occur?
NO
YES
NO
YES
Replace the indoor unit PCB.
Replace the outdoor unit main
PCB (A1P).
Press and hold the button
(
1) on the outdoor unit main
PCB for 5 seconds
The unit will not run for up to
12 minutes.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.