1.
2.
USER
1.
2.
GENERAL
1.
2.
SPECIALIS
T PERSONNEL
EN
EN
KWL
®
Hygrobox KWL HBX EH/WW
Operating and installation instructions
37
14. Error messages and max. operating periods
Max. operating times
Description
Possible causes
UVC tube
UVC tube has reached its maximally rec-
ommended operating time.
Advance warning and warning by operat-
ing hours.
Maximally recommended operating time
reached soon or reached already.
Water filter
Water filter has reached its maximally rec-
ommended operating time.
Advance warning and warning by operat-
ing hours.
Maximally recommended operating time
reached soon or reached already.
Osmosis filter
Osmosis filter has reached its maximally
recommended operating time.
Advance warning and warning by operat-
ing hours.
Maximally recommended operating time
reached soon or reached already.
Error message
Description
Possible causes
Humidity too low
Air humidity at the outlet of the KWL HBX
with active humidity control over a period
of 6 hours is at least 20 % below the target
value set.
Water filter clogged.
Osmosis filter clogged.
Water supply interrupted.
Water valve defective (closed permanently).
Switching output A2 (water valve) defective.
Rotor does not rotate.
Sensor board defective.
Air flow volume too high.
Humidity too high
Air humidity at the outlet of the KWL HBX
with active humidity control over a period
of 4 hours is at least 20 % above the target
value set.
Water valve defective (permanently open).
Switching output A2 (water valve) defec-
tive Sensor board defective.
Drain pump/float switch
Float switch triggered permanently for
more than one hour.
Float switch defective / jammed.
Float switch not connected.
Drain pump defective.
Switching output A1 (drain pump) defec-
tive.
Sensor board defective.
UVC tube/electronic system
Fault message contact of the UVC ballast
open for 10 s.
UVC tube defective.
UVC tube not connected correctly.
UVC ballast defective.
Switching output A3 (UVC ballast) defec-
tive.
DL bus/CAN bus
No bus communication between the con-
troller and the sensor board.
DL bus cable defective / damaged.
DL bus cable not connected
correctly.
Sensor board defective.
Heater battery
Air temperature at the outlet of the KWL
HBX is not reached whilst humidity control
is active. Temperature is below the target
value by at least 3 Kelvin for 15 minutes.
Sensor board defective.
With an electric heater battery:
Heater battery defective / no function.
SSR (solid state relay) defective.
Analog output A9 (0-10 V) defective
Switching output A6 (heater battery) de-
fective.
With a hot water heater battery:
Heater battery defective / no function.
Switching output A4 (pump) defective
Analog output A8 (0-10 V) for mixer de-
fective
Hot water pump defective
Mixing valve defective
Heating water temperature too low
