Daikin REYQ72, Serveice Manual

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SiUS39-602 Troubleshooting by Indication on the Remote Controller
Troubleshooting 181
2.47
“
U5
” Indoor Unit:
Malfunction of Transmission between
Remote Controller and Indoor Unit
Remote
Controller
Display
U5
Applicable
Models All models of indoor units
Method of
Malfunction
Detection In case of controlling with 2-remote controller, check the system using microcomputer is signal
transmission between indoor unit and remote controller (main and sub) is normal.
Malfunction
Decision
Conditions Normal transmission does not continue for specified period.
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
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2823)
NO
YES
YES
NO
Replace indoor unit PC
board.
Set one remote controller 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.
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 "MAIN."
NO
Switch to double-core
independent cable.
replacement
Defect of remote controller PC
board or indoor unit PC board.
Replace whichever is
defective.