14
8. ALARMS
red LED signal
(*)
code and
symbol on di-
splay (flashing)
meaning
cause
solution
alarm relay
activation
action
reset
2 fast flashes
Et
-
Autotest failed
- Fill not connected or insuf-
ficient
- drain open
- faulty float
Check:
•
water supply and
fill valve;
•
blockage of filter on
fill solenoid valve;
•
check drain
solenoid valve and
drain connection;
yes
humidification
interrupted
ESC / Digital 29
5 fast flashes
EP
No production
Malfunction of piezoelectric
transducers
Carry out maintenan-
ce on tank
yes
humidification
interrupted
ESC / Digital 29
3 fast flashes
EF
No water
Interruption to water supply or
fill solenoid valve malfunction
Check:
•
water supply and
fill valve;
•
blockage of filter on
fill solenoid valve
yes
(in the 10
min. waiting
period)
humidification
interrupted
only per 10
minutes
automatic (after
10 minute wait,
see Chap. 5.8)
4 fast flashes
Ed
No drain
Drain solenoid valve/circuit
malfunction
Check drain valve and
drain connection
yes
humidification
interrupted
ESC / Digital 29
5 slow flashes
CL
Tank maintenance
request signal
b5
operating hours for recom-
mended maintenance exceeded
Carry out mainte-
nance on tank and
transducers (cap. 9)
no
signal only
Reset hour
counter (See
Chap 5.6 or 6.8)
6 fast flashes
PU
-
External control si-
gnal not connected
correctly
Cable interrupted/discon-
nected/not connected correctly.
Check the reference
signal (4 to 20 mA or
2 to 10V).
yes
humidification
interrupted
AUTO
2 slow flashes
H^
High humidity
The signal from the probe indi-
cates humidity above 80%rH
Check humidity probe
signal/cable
yes
humidification
interrupted
AUTO
3 slow flashes
H_
Low humidity
The signal from the probe indi-
cates humidity less than 20%rH
Check humidity probe
signal/cable
yes
humidification
interrupted
AUTO
4 slow flashes
EE
EEPROM alarm
Problems in the EEPROM
If the problem
persists, contact the
CAREL service centre
yes
humidification
interrupted
If this persists
contact service
1 fast flash
E0
Functional test not
performed
Functional test not performed
by manufacturer/EEPROM
problems
If the problem
persists, contact the
CAREL service centre
yes
humidification
interrupted
If this persists
contact service
7 slow flashes
OFL
Master Offline
Loss of connection from the
serial master (If D37=1)
Check state of the
Master / Cable
yes
humidification
interrupted
AUTO
8 fast flash
EL
Water level alarm
Level too high during atomised
water production due to:
•
fill SV leak
•
transducer malfunction
•
fan malfunction
Check:
•
fill SV
•
transducers
•
fans
yes
humidification
interrupted
AUTO
6 slow flashes
ES1
ES2
ES3
Alarm on slave unit
1/2/3
Display slave unit from terminal
for details of the alarm
see specific alarm code,
chapter “Network
connection”
yes
signal only
AUTO
1 slow flash
-bu
Backup unit not
available
The backup unit is off or has an
alarm: contact J17 on the main
unit is open
Check the connection
from the alarm relay on
the backup unit to input
J17 on the main unit.
The logic of the alarm
relay on the slave unit
must be NC, settable by
parameter b0
no
signal only
AUTO
Tab. 8.a
To reset the alarms, press ESC once to mute the buzzer, press ESC a second time to completely reset the alarm.
(*) Fast flash: 0.2 seconds ON and 0.2 seconds OFF
Slow flash: 1 second ON and 1 second OFF
1.1 Troubleshooting
