Ferroli F24 Installation, Service And User Instructions Manual page 41

Is relay RY100 switch ON?
YES
NO
Go to charts 2-3
Is 230V present across
fan terminals?
NO
Check air pressure
switch wiring connection
NO
Check and if
necessary replace
air pressure switch
on central heating mode
YES
Normal operation Check wiring connection
carry out
and replace it if necessary
Chart 4
Check fan/fl ue gas system
Does fan run?
NO
YES
Check and if
necessary replace fan
Chart
Check an C
Boiler operated
Does burner
flame modulate?
NO
to CH sensor
Check CH sensor
YES
Is air pressure switch
activated?
NO
Differential air pressure
across the air pressure
switch is greater than
180 Pascal?
NO
Check and clean fan
Check flue and air
intake are correct
and clean
Check Venturi and
air pressure switch
tubes are clean
Check restrictor
is correct
m u at n
Boiler operated
on DHW mode
Does burner
flame modulate?
NO
Check wiring connection
to DHW sensor
Check DHW sensor
and replace it if necessary
YES
Go to chart 5
YES
Check and if
necessary replace
air pressure switch
YES
Normal operation
carry out
41