Description of functioning
t e c h n i c a l
39
F02
In the lighting up process the
PCB
checks if the air pressure switch
contacts are open prior
to the fan starting,if after
3 minutes if the air pressure switch
contacts remain closed then
the boiler will lockout F2 (F21 IN HISTORICAL FAULTS)
In the lighting up process the
PCB
checks if the air pressure switch
contacts are
close
d.I
f after 6 minutes the air pressur
e switch contacts remain open the boiler locks out
If the air pressure switch contacts
open
whilst the boiler is running
another
lighting up
process
will take place
after 2 seconds. If the air pressure switch doesn´t close after 6
minutes the boiler gets lock
s out F2 (F22 F23 HISTORICAL FAULTS)
Possible causes:
- Fan
failure
- Air pressure switch
failure
- Obstruction in the
flue or in flue venturi.
- Faulty PCB
F0
3
If the heating circuit’s pressure
falls below
0
.
5 b, or
the central heating low pressure
switch
fails
(contact
s
open) the boiler
locks out
.
(F31 OR 32 HISTORICAL FAULTS)
F04
If the
high limit
thermostat
activates at 102ºC) or fails (contacts open) the boiler
locks out
.
F05
If there is any failure in the software protections of the boiler control program the boiler
gets locked.The user can not reset this fault, the circuit remains blocked.
(F 51 TO 58 HISTORICAL FAULTS)
F06
The boiler
locks out
if
a flame is
detect
ed
fl ame in the following cases:
I
f
the burner
lights
, before the gas valve is opened
and
fl ame is detected for 6 se
conds
I
f
the burner
shuts down
once the gas valve is closed
, but
fl ame continues
for 6 seconds
When the boiler is in standby mode after 10 second detection of fl ame.
When the boiler
locks out
with th
e above
fault, the pump and the fan
run
or rem
a
in wor-
king. This fault can be
reset
by
the
user.
F
8
33
F8
If there is any failure in the control panel PCB F8 will be displayed the control PCB
will need replacing. Part number (MCB3005)
