40
Error Code and Running Status
Trouble shooting
■ Characters displayed by the LED indicator are explained in the following table.
■ Codes representing normal operation statuses are explained in the following table.
Character Content Character Content Character Content Character Content Character Content Character Content
0/O
2
4
6
8
A
1
3
5
7
9
B
Character Content Character Content Character Content Character Content Character Content Character Content
C
E
H
N
R
U
D
F
L
P
T
Y
Code
Status
Code
Status
Code
Status
NULL: standby
CSP: shutdown during cooling
HEAT: heating
REST: reset
PREH: Pre-heat (for 30min)
HSP: shutdown during heating
COOL: cooling
ToFS: system with changing
water flow rate
ToUS: system with constant
water fl ow rate
S/N
Error Code
Symptom
Possible Cause
Solution
1
Wired controller F6
alarm
Communication
failure between
wired controller
and master unit
1. A/B communication lines of the wired
controller and master unit are incorrectly
connected.
Check and troubleshoot the communication lines.
2. The communication line has broken off.
3. Communication wires between the wired
controller and the master unit cross over
strong-current cables.
Rewire the unit, use shielded communication
lines or keep the communication lines away from
strong current cables.
4. Control panel of the master unit is not
powered on.
Check and troubleshoot the control panel
5. The communication line between the master
unit and the wired controller is too long.
1. Use shield lines.
2. Short the JP7 jumper on the control panel.
6. Can communicate with the monitoring
software while the wired controller sends out
the alarm F6.
Remove resistance R44 on the wire controller or
replace the wire controller.
7. Failure of communication ports on the
control panel of the master unit.
Replace
8. Failure of communication ports on the wired
controller.
Replace
9. Incorrect address setting for the master unit. Check and troubleshoot the communication lines.
2
The LED indicator
of the unit displays
ECXX and the
wired controller
displays XX (XX
represents 00 ~ 14)
Communication
failure of Slave
unit No. XX
1. Communication line of Slave Unit No. XX
has broken off
Check communication cables and solve the
problem.
2. The control panel of Slave Unit No. XX is
not powered on.
Check and troubleshoot the control panel.
3. Incorrect DIP address setting for the slave
unit.
Reset the addresses of all slave units and check
that there is no duplicate address.
4. The number of slave unit is set incorrectly
for the master unit.
Reset the number of slave units and check that
the number match with all the addresses.
5. The PC communication port of the slave unit
has broken down.
1. Exchange positions of the two 485 on Slave
Unit No. XX.
2. Replace the control panel.
6. The communication line of Slave Unit No.
XX is incorrectly connected.
Connect the communication line of Slave Unit No.
XX to Apc/Bpc port.
