Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 346 / 419

Troubleshooting by Error Code SiUS342004EB
339 Part 6 Service Diagnosis
Reference
3.65 Transmission Error between Main and Sub Remote
Controllers
Applicable
Models
All indoor unit models
Error Code
U8
Method of Error
Detection
In case of controlling with 2 remote controllers, check the system using microcomputer if signal
transmission between indoor unit and remote controller (main and sub 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 main and sub remote controller

Connection between sub remote controllers

Defective remote controller PCB
Troubleshooting
Refer to page 64 for Main/Sub setting.
Main/S ub
setting of b oth remote
controllers are set to
S ub .
Main/S ub
setting of the remote
controller is set to
Main.
Set Main/S ub setting of the
remote controller to Main.
T
u rn OFF the power s u pply,
and restart operation.
Set Main/S ub setting of one
remote controller to Main.
T
u rn OFF the power s u pply,
and restart operation.
T u rn the power OFF and
then restart. If an error
occ
u rs, replace the remote
controller PCB.
YES
YES
YES
NO
NO
NO
Using 2 remote
controllers control.
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.