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If the boiler is not going to be used for an extended
period of time, proceed as follows to prepare it for
shutdown.
− Turn the function selector to OFF/RESET.
− Turn the mains power switch OFF .
− Close the fuel shut-off cock and the central hea-
ting and DHW circuit shut-off cocks.
Note that the frost protection and pump anti-block fun-
ctions are not active under these conditions. Drain the
central heating circuit and domestic hot water circuit if
there is any risk of freezing.
3 .4 Warning leds and errors
THE MAIN CONTROL PANEL
Green LED (3)
Off = boiler in stand-by, burner out
On = burning lit, boiler functioning normally.
Red LED (5)
Safety shutdown: an error code flashes on the display.
Burner lockout: the red LED lights and an error code
flashes on the display.
No error code is shown in OFF/RESET mode (
lise any system errors, turn the function selector to "}"
or "{". Error codes are displayed normally in combu-
stion analysis and frost protection modes.
To restore normal functioning, turn the function selector
to "
0
" (OFF/RESET) then return it to its previous posi-
tion: Summer "}", or Winter "{" .
CODE
DESCRIPTION OF ERROR
AL10
Ignition attempts finished (no flame/condensate detected)
AL20
Temperature threshold error
AL21
Low temperature thermostat/condensate pump safety error
AL29
Flue gas sensor overtemperature error
AL71
CH flow temperature sensor error (open/short circuit)
AL73
CH return temperature sensor error (open/short circuit)
AL74
Overtemperature for no water circulation
AL91
Primary heat exchanger needs cleaning (call Technical Assistance)
AL28
CH flow/return sensors temperature differential error
AL26
CH return overtemperature
AL79
CH flow overtemperature, or flow/return sensors temperature differential error
AL41
Low CH water pressure
AL40
Low CH water pressure (after 10 minutes)
AL34
Fan speed error
AL52
Generic electronic error
AL55
Boiler configuration error (configuration jumper missing)
0
). To visua-
1
0
43
3
2
3
4
bar
TECHNICAL ASSISTANCE SERVICE
5
STATUS
Lockout
Lockout
Lockout
Lockout
Shutdown
Shutdown
Lockout
Signalling
Lockout
Lockout
Lockout
Shutdown
Lockout
Lockout
Lockout
Lockout
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