Causes Of Failures And Trouble Shooting - Daikin UAL-A Series Engineering Data

Causes of failures and trouble shooting

S/N Error Code
Wired controller
1
F6 alarm
The LED indicator
of the unit displays
ERXX and the wired
2
controller displays
XX (XX represents
00 ~ 14)
The LED indicator
3 of the unit displays
ER78
Symptom
Communication failure between
wired controller and master unit
Communication failure of Slave
unit No. XX
Communication failure for all
slave units
Possible Cause
1. A/B communication lines of the
wired controller and master unit
are incorrectly connected.
2. The communication line has
broken off.
3. Communication wires between
the wired controller and the
master unit cross over strong-
current cables.
4. Control panel of the master unit is
not powered on.
5. The communication line between
the master unit and the wired
controller is too long.
6. Can communicate with the
monitoring software while the
wired controller sends out the
alarm F6.
7. Failure of communication ports
on the control panel of the master
unit.
8. Failure of communication ports on
the wired controller.
9. Incorrect address setting for the
master unit.
1. Communication line of Slave Unit
No. XX has broken off
2. The control panel of Slave Unit
No. XX is not powered on.
3. Incorrect DIP address setting for
the slave unit
4. The number of slave unit is set
incorrectly for the master unit.
5. The PC communication port of the
slave unit has broken down
6. The communication line of
Slave Unit No. XX is incorrectly
connected.
1. The Bin/Ain communication line of
the master unit has broken off
2. One of the A/B communication
lines is connected incorrectly
3. The Bin/Ain port of the master unit
has broken down
43
Solution
Check and troubleshoot the
communication lines.
Rewire the unit, use shielded
communication lines or keep the
communication lines away from
strong current cables.
Check and troubleshoot the
control panel
1. Use shield lines
2. Short the JP7 jumper on the
control panel
Remove resistance R44 on the
wire controller or replace the wire
controller.
Replace
Replace
Check and troubleshoot the
communication lines.
Check communication cables and
solve the problem.
Check and troubleshoot the
control panel
Reset the addresses of all slave
units and check that there is no
duplicate address
Reset the number of slave units
and check that the number match
with all the addresses
1. Exchange positions of the two
485 on Slave Unit No. XX
2. Replace the control panel
Connect the communication line
of Slave Unit No. XX to Apc/Bpc
port
Reconnect the communication
line to the Bin/Ain port and screw
down the wire terminal
Check the communication line
Replace the control panel of the
master unit