Daikin UWL-B5 Series Catalogue/Engineering Data page 41

Error Code and Running Status
■ Characters displayed by the LED indicator are explained in the following table.
Character Content
0/O
1
Character Content
C
D
■ Codes representing normal operation statuses are explained in the following table.
Code
Trouble shooting
S/N Error Code
Wired controller F6
1
alarm
The LED indicator
of the unit displays
ECXX and the
2
wired controller
displays XX (XX
represents 00 ~ 14)
40
Character Content Character
2
3
Character Content Character
E
F
Status Code
NULL: standby
REST: reset
COOL: cooling
Symptom
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
Communication
powered on.
failure between
5. The communication line between the master
wired controller
unit and the wired controller is too long.
and master unit
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. Check and troubleshoot the communication lines.
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.
Communication
failure of Slave
4. The number of slave unit is set incorrectly
unit No. XX
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.
Content Character Content
4 6
5 7
Content Character Content
H N
L P
Status
CSP: shutdown during cooling
PREH: Pre-heat (for 30min)
ToFS: system with changing
water flow rate
Possible Cause
Character Content Character
8
9
Character Content Character
R
T
Code Status
HEAT: heating
HSP: shutdown during heating
ToUS: system with constant
water fl ow rate
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 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.
Content
A
B
Content
U
Y