Daikin R407C PLUS - Malfunction of Transmission between Remote Controller and Indoor Unit

Troubleshooting Si33-105
184 Troubleshooting R407C PLUS Series Heat Recovery System
3.28 Malfunction of Transmission Between Remote
Controller and Indoor Unit
Remote
Controller
Display
U5
Supposed
Causes
!
Malfunction of indoor unit remote controller transmission
!
Connection of two main remote controllers (when using 2 remote controllers)
!
Defect of indoor unit PC board
!
Defect of remote controller PC board
!
Malfunction of transmission caused by noise
Troubleshooting
(VF055)
NO
YES
YES
NO
Replace indoor unit PC
board.
Set one remote controller
to "SLAVE"; 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.
NO
NO
Using
2-remote controllers
control.
All indoor
PC board microcomputer
monitors blink.
YES
Multi-core
cable is used for the indoor
unit remote controller
transmission
wiring.
Operation
returns to normal when the
power is turned off
momentarily.
YES
YES
SS1
of both remote controllers is
set to "MASTER."
NO
Switch to double-core
independent cable.
replacement
Defect of remote controller
PC board or indoor unit PC
board. Replace whichever
is defective.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.