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The display will show the message AL 3 – "SMOKE TEMP".
The boiler constantly checks operation of the smoke sensor, if the sensor is momentarily and/or
accidentally removed from its housing, or the connector is not correctly positioned on the electronic board or
the sensor fails for any reason, the fault is signalled via display message AL 2 – "SMOKE SENSOR".
8.1.4 Water temperature sensor
The water sensor is directly connected to the electronic board and keeps operating water temperature in the
boiler under constant control, allowing safe use of the boiler.
How it works
If water temperature exceeds the first pre-set temperature limit, the board passes into modulation mode. The
display will show the message "modulate". At the same time if, despite passage to modulation, the water
temperature continues to increase and exceeds the second pre-set safety limit (about 90 °C), the boiler will
pass into alarm mode.
The display will show the message AL A – WATER TEMP".
The boiler constantly checks water probe operation, if the sensor is momentarily and/or accidentally
removed from its housing, or the connector is not correctly positioned on the electronic board or the sensor
fails for any reason. The fault is signalled via display message AL 9 – "WATER SENSOR".
8.1.5 Water pressure switch
The water pressure switch is directly connected to the electronic board and keeps operating water
temperature in the boiler under constant control, allowing safe use of the boiler.
How it works
If water pressure drops below 0.5 bar or over 2.5 bar, the boiler passes into alarm mode and AL b – "WATER
PRESS" appears on the display.
8.2
Alarms
When an operating anomaly occurs, the board intervenes to signal the irregularities, operating in different
modes depending on the type of alarm. The following alarms can occur:
EACH ALARM CONDITION CAUSES IMMEDIATE BOILER SHUTDOWN
To exit from an alarm condition, always press button "4" until the message "FINAL CLEANING"
appears.
You will also need to take additional steps, depending on the type of alarm generated
If you do not exit from the alarm condition within a given time (a few hours), the alarm will be sent into boiler
memory and the display will show the message "ALARM MEMORY". To exit from this condition, press button
"4" as per above.
Cause of alarm
No power
Smoke temperature sensor
Smoke overtemperature
Smoke fan fault
No start-up
Shutdown during work mode
General safety thermostat
Safety pressure switch
No or low water sensor
Water overtemperature
Water press. outside allowed
values
Display message
AL1 BLACK-OUT
AL2 SMOKE SENSOR
AL3 SMOKE TEMP
AL4 EXTRACT FAULT
AL5 NO START
AL6 NO PELLET
AL7 THERMAL SAFETY
AL8 NO VACUUM
AL9 WATER SENSOR
ALa WATER TEMP
ALb WATER PRESS
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