daikin RZQ100

[matt.afshin]

Hi
I have changed the pcb and inverter in Daikin RZQ100
and I with new pcb in my remote control U4 error comes up. in out door pcb green HAP light bilking and red is off. and on inverter board green light is on
Dose any body know about this problem??
I am So please if you can give your idea..

[martinw58]

some pcbs need to have the dip switches set befor instaling as the same board can fit several units 4.2 Malfunction of Transmission between Indoor and Outdoor Unit (
U4 or UF)
Error code
U4 or UF
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...).
Troubleshooting 1
Diagnosis of incorrect or broken/disconnected wiring. If the LEDs on the indoor unit PC board are off,
it indicates that the transmission wiring between indoor and outdoor units may be incorrect or
broken/disconnected.
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Does
outdoor unit
microcomputer
normal H1P
flash?
Is
indoor-outdoor
transmission wire
connected
correctly?
Is H1P flashing?
NO YES
NO
NO
NO
NO (ON or OFF)
NO (OFF)
YES
YES
YES
Is HAP flashing?
Is HBP flashing?
To outdoor unit
(next page)
Is H2P on?
Check of
indoor unit
microcomputer
normal
HAP
Check of
indoor unit
transmission
malfunction
HBP
YES
YES
Turn the power supply off
once and then back on.
Failure of indoor unit PCB or
malfunction of power supply
system.
Resets normally.
Could be outside
cause (noise...).
Failure of indoor unit PCB.
Wire correctly.

[The Viking]

What was the original problem?

Did you fit the capacity plug to the new PCB?

[Brian_UK]

Not the same model, I was working on an old K Series but after repowering the outdoor the U4 code keep showing until the system had 'rebooted' itself.

Have you run a wiring check on the PCB and allowed the unit to self-test?