Daikin R-410A Service Manual page 212

Sky-air indoor
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Error Codes: System Malfunctions
1.3
Malfunction of Transmission between Indoor Unit and remote control (U5)
1
Error code
Error generation
Causes
3
3
Troubleshooting
4
5
Caution
4–6
U5
The error is generated when the microprocessor detects that the transmission between the indoor unit
and the remote control is not normal over a certain amount of time.
The possible causes are:
Malfunctioning remote control
Malfunctioning indoor PCB
Outside cause (noise...)
Connection of two master remote controls (when using two remote controls).
Control by 2 remote
controllers
NO
All indoor
unit PCB
microcomputer
normal monitors
flashing
YES
Using
multicore
transmission wiring
between indoor unit
and remote
controller
NO
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
SS1 of both
YES
remote controllers is
set to MAIN.
Resets
normally when
NO
power supply is turned
off temporarily.
YES
YES
ESIEN05-04
Set one of the remote
controllers to SUB, turn
YES
off the power supply
temporarily, then restart
operation.
NO
Indoor unit PCB
replacement.
Malfunction could be
produced by noise.
Check the surrounding
area and restart
operation.
Change to
double-core
independent cable.
Failure of remote
controller PCB or
replacement of
defective indoor
unit PCB.
Part 3 – Troubleshooting

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