U5" Malfunction Of Transmission Between Remote Control And Indoor Unit - Daikin VRVIII-S Service Manual

SiENBE34-703
3.41 "U5 " Malfunction of Transmission between remote
control and Indoor Unit
U5
remote control
Display
Applicable
AII indoor unit models
Models
Method of
In case of controlling with 2-remote control, check the system using microcomputer is signal
transmission between indoor unit and remote control (main and sub) is normal.
Malfunction
Detection
Malfunction
Normal transmission does not continue for specified period.
Decision
Conditions
Supposed ! Malfunction of indoor unit remote control transmission
! Connection of two main remote controls (when using 2 remote controls)
Causes
! Defect of indoor unit PC board
! Defect of remote control PC board
! Malfunction of transmission caused by noise
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
YES
Using 2-remote
controls control.
NO
All indoor PC board
NO
microcomputer monitors
blink.
YES
Multi-core
cable is used for the
YES
indoor unit remote control
transmission wiring.
NO
Troubleshooting by Indication on the remote control
YES
SS1 of both remote
controls is set to "MAIN."
NO
Operation
returns to normal
NO
when the power is turned
off momentarily.
YES
Set one remote control to
"SUB"; turn the power supply
off once and then back on.
Replace indoor unit PC
board.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Switch to double-core
independent cable.
replacement
Defect of remote controller PC
board or indoor unit PC board.
Replace whichever is
defective.
(V2823)
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