U4", "Uf" Malfunction Of Transmission Between Indoor And Outdoor Unit - Daikin SkyAir Service Manual

Troubleshooting by Remote Controller Display / LED Display
5.39 "U4", "UF" Malfunction of Transmission between Indoor
and Outdoor Unit
U4
Remote
Controller
Display
Applicable RZQ(S)71~140
Models
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.
Supposed The possible causes are:
Causes
216
UF
or
Wiring indoor-outdoor transmission wire is incorrect
Malfunctioning indoor unit PC board
Malfunctioning outdoor unit PC board
burning out fuse
Faulty fan motor
Outside cause (noise...).
SiBE28-804
Troubleshooting