External Cleaning; Operational Faults - Biasi Activ A 250V User Manual And Installation Instructions

ried out:
• condensing heat exchanger
• burner;
• exhaust fume duct and fl ue;
• pressurisation of the expansion tank;
• fi lling up of the central heating circuit;
• bleeding of air from the central heating
system;
• general check of the appliance's opera-
tion.
3.5

External cleaning

Before carrying out any clean-
ing, disconnect the appliance
from the electrical mains, using
the fused spur isolation switch
fi tted adjacent to the appliance.
To clean the external panels, use a cloth
soaked in soapy water. Do not use solvents,
abrasive powders or sponges.
Do not carry out cleaning of the appliance
and/or its parts with readily fl ammable sub-
stances (for example petrol, alcohols, naph-
tha, etc.).
3.6

Operational faults

If the boiler does not function and a code
that alternates between the letter Er and the
writing reset ( see "LCD general features" to
page 10 ) appear on the LCD display, it indi-
cates that the safety lock-out has stopped
the boiler. The display background fl ashes
( Fig. 3.3 ).
USEFUL ADVICE
Fig. 3.3
For the fi rst 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.
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.
Press the reset key on the boiler control
panel 9 ( Fig. 3.1 ) to reset its functioning.
Other operational faults signalled on the
LCD display
If the LCD display displays a code that al-
ternates between the letter Er and the
symbol, the boiler has an anomaly that can-
not be reset.
The display background fl ashes ( Fig. 3.4 ).
RESET
RESET
In this case and in case of per-
sistent lock-out call a competent
and responsible Service Engi-
neer.
- 17 -