Transmission Error Between Remote Controller And Indoor Unit - Daikin REYQ-XA Service Manual

SiUS371901E
3.66 Transmission Error between Remote Controller and
Indoor Unit
U5
Error Code
Applicable All indoor unit models
Models
Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal.
Detection
Error Decision
Transmission is not carried out normally for a certain amount of time
Conditions
Supposed
Causes
Troubleshooting
Refer to page 90 for Main/Sub setting.
Service Diagnosis
Transmission error between indoor unit and remote controller
Connection of 2 main remote controllers (when using 2 remote controllers)
Defective indoor unit control PCB
Defective remote controller PCB
Transmission error caused by noise
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Control by
2 remote controllers
NO
All indoor unit
control PCB microcomputer
normal monitors
blinking
YES
Replace the remote controller
and restart operation.
Is operation normal?
NO
Replace the indoor unit control
PCB and restart operation.
Is operation normal?
NO
Main/Sub
YES
setting of both
remote controllers is
set to Main.
NO
Resets
normally when
NO
power supply is turned
OFF temporarily.
YES
YES
YES
Troubleshooting by Error Code
YES
Set one of the remote
controllers to Sub, turn OFF
the power supply temporarily,
then restart operation.
NO
Replace the indoor unit
control PCB.
The error could be produced by
noise. Check the surrounding
area and restart operation. (Ex.:
Heavy-duty wireless equipment,
etc.)
Normal.
Normal.
The error could be produced by
noise. Check the surrounding
area and restart operation.
348