Error Codes: System Malfunctions ESIE02–01
3–60 Part 3 – Troubleshooting
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4.5 Transmission Error between Indoor Unit and Remote Control (U5)
Error code U5
LED indication The table below shows the LED indication.
Error generation 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.
Causes The possible causes are:
■ Malfunctioning remote control
■ Malfunctioning indoor PCB
■ Outside cause (noise...)
■ Connection of two master remote controls (when using two remote controls).
Troubleshooting To troubleshoot, proceed as follows:
Operation HAP (green) H1P (red) H2P (red)
Normal 688
Malfunctioning ———
Set one of the
remote controllers
to SUB, turn off
the power supply
temporarily, then
restart operation.
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.
All indoor
unit PCB
microcomputer
normal monitors
flashing
Using
multicore
transmission wiring
between indoor unit
and remote
controller
Control by 2 remote
controllers
NO
YES
YES
YES
YES
Resets
normally when
power supply is turned
off temporarily.
NO
SS1 of both
remote controllers is
set to MAIN.
YES
NO NO
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