64
EN
Yes
Yes
Yes
Yes
Yes
No
Motor start-
up
Lock-out
during
the pre-
ventilation
phase
There’s a
false flame
signal
Eliminate the
cause of the
false flame
signal
No
Replace the
flame sensor
Replace the
control and
command
device
Check the flame
sensor’s efficiency
**
Does the flame
sensor work
correctly?
Yes
Heat request
Heating phase
Fig. 56
(**) CHECKING THE FLAME SENSOR’S EFFICIENCY
Check the
procedure
Hold the
sensor
Block light to
the sensor
The sensor detects
external light
Lock-out
after 20 s
Lock-out
before 15 s
1 reset
1 reset
Fig. 57
