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

ESIE02–01
4.4 Transmission Error between Indoor and Outdoor Unit (U4 or UF)
U4
Error code
LED indication The table below shows the LED indication.
Operation
Normal
Malfunctioning
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:
Part 3 – Troubleshooting
UF
or
HAP (green)
Wiring indoor-outdoor transmission wire is incorrect
Malfunctioning indoor unit PCB
Malfunctioning outdoor unit PCB
Outside cause (noise...).
Error Codes: System Malfunctions
H1P (red)
6 8
— —
1
H2P (red)
8
—
3 3
4
5
3–57