22
ENG
“Ultrasound for fancoil” +0300059IE - rel. 1.5 - 15.07.2019
red LED signal
(*)
code and
symbol on di-
splay (fl ashing)
meaning
cause
solution
alarm relay
activation
action
reset
9 fast fl ashes
EtL
End of piezoelectric
transducer life
The unit has reached AF
working hours (default 9999 h)
Replace the
piezoelectric
transducers to
guarantee rated unit
production
yes
signal only
Reset internal
piezoelectric
transducer coun-
ter by setting
parameter d6 to
zero (See chapter
5.8)
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 fl ash: 0.2 seconds ON and 0.2 seconds OFF
Slow fl ash: 1 second ON and 1 second OFF
8.1 Troubleshooting
Note:
if the problem identifi ed cannot be solved using the following
guide, contact CAREL technical service.
1.
Firstly, check the humidifi er and the surrounding area.
Problem
Cause
Check
Solution
No atomised water
production
Power supply
Terminal M14 open
Visual verify
Connetct
terminal M14 to a bridge
No power
Measure the voltage at the humidifi er
input terminals of the transformer
Connect power
Power supply fault
Measure the voltage at the power
supply output terminals
Replace the power supply
Feedwater system
Valve closed upstream
Check
Open the valve
The quantity of atomised
water is too low
Power supply
Low power supply voltage
Check the voltage at the power supply
output terminals
Replace the power supply, if
damaged
Feedwater system
Water level during production
is too high and overfl owing
Check visually
See table 2)
Other
The humidifi er is not installed
horizontally
Check visually
Adjust
No atomised water
production
Dust and foreign matter accumulated in the tank (*)
Clean the inside of the tank
Transducer deterioration
Verify the d6 >0 parameter
Repalce if d6=0
The quantity of atomised
water is too low
Dust and foreign matter accumulated in the tank (*)
Check a view the inside of the tank
Scale build-up on the surface of the piezoelectric
transducers (*)
Clean the inside of the tank
and replace the transducers
Tab. 8.b
(*) These malfunctions can be avoided by carrying out preventive
maintenance.
2.
If the cause has not been identifi ed with the previous checks, there
may be faulty components. Check the inside of the humidifi er.
Problem
Cause
Check
Solution
No atomised water
production
Feedwater system Float level sensor fault
Empty the tank, remove the electronic board
and check continuity of the level sensor
Contact service to replace the level
sensor
Float level sensor blocked
Clean the sensor. If normal opera-
tion is not restored, replace
Fill valve fault
No water fi lled even when the tank has been
emptied
Replace the valve
Clean the sensor. If normal opera-
tion is not restored, replace
Other
The fan cables are loose or
detached
Check connection after removing the
humidifi er cover
Restore correct connection to the
terminals
The quantity of
atomised
water is too low
Water level over-
fl ow
Float level sensor blocked
If the water level in the tank reaches the overfl ow
pipe, remove the connector from the control board
and check continuity of the level sensor
If there is continuity, contact service
to replace the level sensor
Fill valve fault
Water is fi lled even after switching off the appliance Replace the fi ll valve
Tab. 8.c
