Daikin VRV S RXQ4/5ARV1 - Transmission Error between Remote Controller and Indoor Unit

Troubleshooting by Error Code SiAF332111E
314 Part 6 Service Diagnosis
Reference
5.61 Transmission Error between Remote Controller and
Indoor Unit
Applicable
Models
All indoor unit models
Error code U5
Method of Error
Detection
Microcomputer checks if transmission between indoor unit and remote controller is normal.
Error Decision
Conditions
When transmission is not carried out normally for a certain amount of time.
Supposed
Causes
 Transmission error between indoor unit and remote controller
 Connection of 2 main remote controllers (when using 2 remote controllers)
 Defective indoor unit PCB
 Defective remote controller PCB
 Transmission error caused by noise
Troubleshooting
Refer to page 43 for Main/Sub setting.
Control by 2
remote controllers
Main/Sub
setting of both
remote controllers is
set to Main.
All indoor unit
PCB microcomputer
normal monitors
blinking
Resets
normally when
power supply is turned
OFF temporarily.
NO
NO
NO
YES
NO
Replace the indoor unit
PCB.
Set one of the remote
controllers to Sub, turn OFF
the power supply temporarily,
then restart operation.
The error could be produced by
noise. Check the surrounding
area and restart operation.
The error could be produced by
noise. Check the surrounding
area and restart operation. (Ex.:
Heavy-duty wireless equipment,
etc.)
Normal.
Normal.
NO
NO
YES
YES
YES
Replace the remote controller
and restart operation.
YES
Replace the indoor unit PCB
and restart operation.
Is operation normal?
Is operation normal?
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.