Code Alarm Cause Possible solution Reset Action
force pre-
heating
preheating activation to protect the
humidifier
the temperature inside the humidifier by fitting additional heaters
where necessary.
ALA17
AntiFreeze
Slave force
pre-heating
AntiFreeze in Slave unit. Temperature
below 10°C, preheating activation to
protect the humidifier
check the temperature inside and outside of the humidifier. Increase
the temperature inside the humidifier by fitting additional heaters
where necessary.
ALP21 SV Offline Supervisor Offline
ALW07
Warning
Autotest
Slave
Autotestwarning in Slave unit.
Probable problems with: Feedwater,
level control, fill solenoid valve Note:
check the alarm log for any
warnings relating to the events that
generated the alarm (autotest
warning, level sensor warning, low
production warning)
Make sure that the unit receives water. Switch the unit off and clean
the level control and the fill valve
Signal only
ALW09
Alarm
Autotest
Slave
Autotestalarm in Slave unit. Probable
problems with: Feedwater, level
control, fill solenoid valve. Note:
check the alarm log for any
warnings relating to the events that
generated the alarm (autotest
warning, level sensor warning, low
production warning)
Make sure that the unit receives water. Switch the unit off and clean
the level control and the fill valve
ALW10
Warning
Sensor level
Slave
Warning level sensor in Slave unit.
The level sensor may not be working
correctly
Switch the unit off and clean the boiler, the level sensor and the fill
valve. Check correct filling of water in boiler
Signal only
ALW11
Warning
Low
production
Slave
Warning low production in Slave
unit. Input power not available; With
the unit on, there is no steam
production or water preheating; flue
gas outlet or air intake blocked; gas
shut-off valve closed, burner and/or
controller malfunction
check the gas pressure and that the gas shut-off valve is open; make
sure that the air intake is not blocked; check the fan power
connection; check operation of the brushless fan, the flue gas outlet
and air intake; burner flame malfunction; check the connections
between the flame control board and the burner, and between the
electrical panel and the flame control; check the connections
between the unit controller and the intermediate terminal block in
the electrical panel
Signal only
Tab.13.a
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