External Cleaning; Operational Faults - Biasi M300V.2025 SM User Manual And Installation Instructions

tion.
Please refer to the servicing information on
section "MAINTENANCE" on page 76.
3.5

External cleaning

Before carrying out any clean-
ing, disconnect the appliance
from the electrical mains, using
the fused spur isolation switch
fitted 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 flammable 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 "E" and
the writing RESET (see "LCD general fea-
tures" on page 10) appear on the LCD
display, it indicates that the safety lock-out
has stopped the boiler. The display back-
ground flashes (Fig. 3.3).
Fig. 3.3
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.
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
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USEFUL ADVICE
the condensate drainage pipe and traps for
cleanness.
Press the reset key on the boiler control
panel 14 (Fig. 3.1) to reset its functioning.
After three reset attempts made by press-
ing the reset key 14 (Fig. 3.1), code "E91"
and the symbol
LCD display. The boiler is in lockout mode.
Fig. 3.4
To restore boiler operation, disconnect the
electrical power supply. Then, reconnect it
and press buttons 12, 13 and 14 (Fig. 3.1)
on the boiler control panel at the same time
for at least 5s.
Other operational faults signalled on the
LCD display
If the LCD display displays a code that al-
ternates between the letter "E" and the
symbol, the boiler has an anomaly that can-
not be reset.
The display background flashes (Fig. 3.5).
Fig. 3.5
Another possible signal occurs when the
D.H.W. exchanger cannot exchange all of
In this case and in case of per-
sistent lock-out call a compe-
tent and responsible Service
Engineer.
A
(Fig. 3.4) appear on the
A