40
INSTALLER
USER
MAINTENANCE TECHNICIAN
TECHNICAL DATA
Trouble Possible causes Solutions
Smell of gas
Caused by leakage from gas circuit pipe-
lines
Check sealing eciency of gas intake circuit.
e fan works but ignition
discharge does not occur
on the burner ramp
e fan may start but the safety air pres-
sure switch does not switch the contact
over.
Make sure:
1) the intake-exhaust duct is not too long (over allowed length).
2) the intake-exhaust pipe is not partially blocked (on the exhaust or
intake side).
3) the diaphragm of the fume exhaust is adequate for the length of the
intake-exhaust duct.
4) the sealed chamber is kept in good conditions.
5) the fan power supply voltage is not less than 196 V.
Irregular combustion (red
or yellow ame).
Can be caused by: dirty burner, clogged
lamellar pack, intake - exhaust terminal
not installed properly.
Clean the above components and ensure correct installation of the
terminal.
Frequent activation of
the temperature overload
thermostat
It can depend on reduced water pres-
sure in the boiler, little circulation in the
heating system, the blocked pump or an
anomaly of the boiler P.C.B.
- Check on the pressure gauge that the system pressure is within established
limits.
- Check that radiator valves are not all closed.
Abnormal noises in the
system
Air in the system.
- Check opening of the special air vent valve cap (Fig. 33).
- Make sure the system pressure and expansion vessel factory-set pressure
values are within the set limits; the factory-set value for the expansion
vessel must be 1.0 bar, and system pressure between 1 and 1.2 bar.
Ignition block
In the event of request of room central
heating or domestic hot water produc-
tion, the boiler does not switch on within
the preset time. Upon appliance commis-
sioning or aer extended downtime, it
may be necessary to eliminate the block.
Press the Reset button (1).
Low water ow
Can be caused by on limescale deposits
(calcium and magnesium)
Contact a qualied technician for descaling e.g. Aer-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 eciency of the heat exchanger, a non corrosive
descaler must be used. Cleaning must be carried out without the use of
tools which can damage the heat exchanger.
Presence of condensation
on the boiler.
It can be determined
by functioning at boiler temperatures
that are excessively low.
In this case, make the
boiler run at higher temperatures.
3.6 POSSIBLE PROBLEMS AND THEIR CAUSES.
Maintenance interventions must be carried out by
an authorised company (e.g. Authorised Aer-Sales
Technical Assistance Service).
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