Daikin VRVIII-S, Service Manual

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SiENBE34-703 Troubleshooting by Indication on the remote control
Troubleshooting 171
3.41 “
U5
” Malfunction of Transmission between remote
control and Indoor Unit
remote control
Display
U5
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection 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
Decision
Conditions Normal transmission does not continue for specified period.
Supposed
Causes
!
Malfunction of indoor unit remote control transmission
! Connection of two main remote controls (when using 2 remote controls)
! Defect of indoor unit PC board
! Defect of remote control PC board
! Malfunction of transmission caused by noise
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2823)
Caution
Replace indoor unit PC
board.
Set one remote control to
"SUB"; turn the power supply
off once and then back on.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Using 2-remote
controls control.
All indoor PC board
microcomputer monitors
blink.
Multi-core
cable is used for the
indoor unit remote control
transmission wiring.
Operation
returns to normal
when the power is turned
off momentarily.
SS1 of both remote
controls is set to "MAIN."
Switch to double-core
independent cable.
replacement
Defect of remote controller PC
board or indoor unit PC board.
Replace whichever is
defective.
YES YES
NO
NO
NO NO
NO
YES YES
YES