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stances (for example petrol, alcohols, naph-
tha, etc.).
3.6
Operational faults
If the lock-out signal lamp comes on
This indicates that the safety lock-out 6 (Fig.
3.2) has stopped the boiler.
To re-start the boiler, it is necessary to press
the boiler reset button 7 (Fig. 3.2).
Fig. 3.2
For the first lighting up and following main-
tenance procedures for the gas supply, it
may be necessary to repeat the resetting
operation several times so as to remove the
air present in the pipe work.
After five consecutive resetting attempts the
reset button is inhibited. To restore its func-
tion it is necessary to switch the boiler off
and on from the electrical mains, using the
fused spur isolation switch fitted adjacent to
the appliance.
Safety lock-out may occur even in case of a
blockage of the condensate drainage (e.g.
plugged drain pipe).
It is advisable to check the condensate
drainage pipe and traps for cleanness.
In this case and in case of persist-
ent lock-out call a competent and
responsible Service Engineer.
- 20 -
USEFUL ADVICE
7 6
If noises due to air bubbles are heard
during operation...
You should check that the pressure on the
temperature and pressure gauge (Fig. 2.2
on page 10) is not below the correct setting.
If required, top up the system correctly, as
described in the section "Refilling proce-
dure" to page 10.
Bleed any air present in the radiators, if nec-
essary.
If the pressure on the temperature and
pressure gauge (4on page 8) has gone
down...
It is necessary to top up the appliance with
water again, so as to raise the pressure to
an adequate level as described in the sec-
tion "Refilling procedure" to page 10. If top-
ping up with water has to be done very fre-
quently, have the system checked for leaks.
If water comes out of the pressure relief
valve
Check on the temperature and pressure
gauge (4on page 8) that the pressure in the
central heating circuit is not close to 3 bars.
In this case, temperature rise in the circuit
can cause the pressure relief valve to open.
So that this does not happen and to de-
crease the pressure to a normal value, it is
advisable to vent some of the water in the
appliance through the bleed valves present
in the radiators.
If in time, a reduction in domestic hot
water supply is observed...
The likely causes may be impurities caught
in the domestic hot water flow switch filter or
limescale deposited in the domestic hot wa-
ter heat exchanger. It is advisable to have
the appliance cleaned out by an Authorised
Service Centre Engineer.
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