4
Warning message
Description of malfunction
Trouble shooting
BLW-X: Blower RPM low
The speed of blower X has been lower
than the speed of the leading blower for
more than five seconds.
Corrective action by unit
: the unit con-
tinues to monitor the blower speed
1. Make sure blower in question is cor-
rectly connected and it is receiving
correct voltage.
. Check operation of blowers in the diag-
nostic output test for abnormalities.
. Set blower in question as lead blower
and see if other blowers get Blower
High Warning.
4. Blower speed is decreasing due to
wear. Unit is safe to operate but output
is reduced.
5. Order new blower.
HMW: Service due
The maintenance interval time has
elapsed.
Corrective action by unit
: the unit will
continue to run for 7 hours before a fault
is generated
Service the unit according the maintenance
instructions.
FTW: Fill timeout
The fill valve has been activated for a
certain period of time but the the unit is
still at float level zero.
Corrective action by unit
: fill valve re-
mains activated. A fault message is trig-
gered if the float level remains at zero after
next time window.
1. Make sure that drain pump, auxiliary
drain valve or manual drain switch are
not activated.
. Make sure that the water supply line is
open and the water supply meets the
requirements (10 L/min ; -8bar).
. Check fill valve using the diagnostic
output test.
4. Check wiring to float board and fill
valve.
5. Clean water assembly of the unit.
RHHW: RH to high
The measured relative humidity is
higher than the “RH high” setting.
Corrective action by unit
: none. The
humidifier remains in standby mode until
the measured relative humidity drops
below setpoint.
1. Check that “RH high” setting is correct
for the application.
. Make sure sensor is not influenced by
other sources of humidity (wash basin,
Sink, etc.).
. Check the location of sensor (too close
to steam distributor?)
4. System might be oversized. Try to limit
capacity of the unit.
RHLW: RH to low
The measured relative humidity is
lower than the “RH low” setting.
Corrective action by unit
: none. The
humidifier should be operating unless it
is in standby or lockout mode.
1. Check that “RH low” setting is correct
for the application.
. Is humidifier in lockout or standby?
Investigate why humidifier is not op-
erational.
. Check that sensor is not near a door
or window or in any location that may
give a false reading
4. System could be undersized. Check
power limit settings.
5. Check that all burners are opera-
tional.
RHW: RH signal defect
The RH signal input is lower than %
Corrective action by unit
: the operation
is interrupted until an
input signal higher than % is received.
1. Check connection between sensor and
unit.
. Check that sensor is functional
. Check control settings of the unit.
4. Make sure controls are located such
that they provide accurate readings.
