18
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.3 TROUBLESHOOTING
NOTE:
maintenance operations must be carried
out by an authorised company (e.g. Authorised
After-Sales Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing efficiency of gas intake
circuit.
- Irregular combustion (red or yellow flame).
When the burner is dirty or the boiler lamellar
pack is blocked. Clean the burner or the lamel-
lar pack.
- Frequent activation of the temperature over-
load thermostat. It can depend on the lack of
water in the boiler, little water circulation in the
system or blocked pump. Check on the pressure
gauge that the system pressure is within estab-
lished limits. Check that the radiator valves
are not closed and also the functionality of the
pump.
- The boiler produces condensate. This can be
caused by obstructions of the chimney or flues
with height or section not proportioned to the
boiler. It can also be determined by function-
ing at boiler temperatures that are excessively
low. In this case, make the boiler run at higher
temperatures.
- Frequent interventions of the chimney safety
thermostat. This can be caused by obstructions
in the fumes circuit. Check the flue. The flue
may be obstructed or by height or section
not suitable for the boiler. Ventilation may be
insufficient (see room ventilation point).
- Presence of air in the system. Check opening
of the special air vent valve cap
(Fig. 9)
. Make
sure the system pressure and expansion vessel
pressure values are within the set limits; the
pressure value for the expansion vessel must be
1.0 bar, and system pressure must be between
1 and 1.2 bar.
- Ignition block and Chimney block. See
Par
.
2.5.
- Poor water flow: if, as a result of limestone
(calcium and magnesium), the domestic hot
water system does not work properly, contact a
qualified company for descaling e.g. Authorised
After-Sales Technical Service. Descaling must
be carried out on the domestic hot water side
of the bithermal heat exchanger in accordance
with good practice. To preserve integrity and
efficiency of the heat exchanger, a non corro-
sive descaler must be used. Cleaning must be
carried out without the use of tools which can
damage the heat exchanger.
