Daikin Sky Air R-407C - Transmission Error between Indoor and Outdoor Unit (U4 or UF)

ESIE02–01 Error Codes: System Malfunctions
Part 3 – Troubleshooting 3–57
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4.4 Transmission Error between Indoor and Outdoor Unit (U4 or UF)
Error code U4 or UF
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 and
the outdoor unit is not normal over a certain amount of time.
Causes The possible causes are:
■ Wiring indoor-outdoor transmission wire is incorrect
■ Malfunctioning indoor unit PCB
■ Malfunctioning outdoor unit PCB
■ Outside cause (noise...).
Operation HAP (green) H1P (red) H2P (red)
Normal 688
Malfunctioning — — —