Transmission Error Between Indoor Unit And Remote Control - Daikin Sky Air R-407C Service Manual

Error Codes: System Malfunctions
4.5 Transmission Error between Indoor Unit and Remote Control (U5)
1
Error code
LED indication
Error generation
3 3
Causes
4
Troubleshooting
5
3–60
U5
The table below shows the LED indication.
Operation
Normal
Malfunctioning
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).
To troubleshoot, proceed as follows:
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
HAP (green)
6
—
SS1 of both
YES
remote controllers is
set to MAIN.
Resets
normally when
NO
power supply is turned
off temporarily.
YES
YES
H1P (red) H2P (red)
8 8
— —
Set one of the
YES
remote controllers
to SUB, turn off
the power supply
temporarily, then
restart operation.
Indoor unit PCB
NO
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
ESIE02–01