6
Externa 30 O
Cod. 3540T540 - 04/2009 (Rev. 00)
Before calling the service centre, check that the problem is not due to no gas or mains power
supply.
System water pressure control
The boiler is fitted with a cock for manually filling
the central heating system. The filling pressure when
the system is cold, as read on the boiler hydrometer,
must be around 1.0 bar.
If the pressure drops during operation (due to the
evaporation of the gas dissolved in the water) to a
value lower than the minimum described above, the
User must restore the initial value using the filling
cock. Once the operation is completed, always close
the filling cock.
1.5 Maintenance
It is recommended to have annual maintenance of the heating system performed by qualified person-
nel, and at least biennial checks on the combustion device. Please refer to Chap. 3.3 in this manual for
further information.
The casing, the control panel and the aesthetic parts of the boiler can be cleaned using a soft and damp
cloth, dipped in soapy water if necessary. Do not use abrasive detergents or solvents.
1.6 Troubleshooting
Any anomalies or operating faults are signalled by the LEDs on the control panel.
The following table lists the faults that may arise due to simple problems that can be resolved by the
user.
fig. 2
bar
Table 2
Boiler shut-down
Insufficient system pressure
(light flashing)
LED
Check if the gas cocks upstream of the boiler and on the counter are
open.
Turn knob A Fig. 1 to Reset and then release it.
In the event of repeated boiler shut-downs, contact the nearest service
centre.
Fill the system when cold to 1-1.5 bar, using the cock located on the
boiler.
Close the cock after use.
Problem
Solution
Filling cock
