Ferroli MAXIMA 35 S Instructions For Use, Installation And Maintenance page 28

Fault
F25
Software fault
F26 Flame absence after ignition
phase
F30 CH flow sensor fault
F31 CH flow sensor fault
F34 Supply voltage under 190V.
or over 250V.
F35 Irregular mains frequency
Main P.C.B. fault
F36
F37 Incorrect system water
pressure
Incorrect system water
F40
pressure
Pressure sensor fault
F41
Return sensor fault
F43
Return sensor fault
F44
Flue gas sensor fault
F45
Flue gas sensor fault
F46
Pressure sensor
F47
not connected
28
Possible cause
• Software operating fault
• Blocked flue system
• Low gas pressure
• Sensor damaged or short
circuited
• Sensor damaged or wiring
broken
• Electric mains fault
• Electric mains fault
• Faulty main P.C.B.
• Water on P.C.B.
• Pressure too low
• Sensor damaged
• Pressure too high above
3 - 5 bar
• Sensor damaged or wiring
broken
• Sensor damaged or wiring
shorted
• Sensor damaged or wiring
broken
• Sensor damaged or wiring
shorted
• Sensor damaged or wiring
broken
• Wiring broken
Maxima 35 S
Cure
• Cut off and restore the electricity
supply. If the trouble remains,
check and/or change the main P.C.B.
• Clear the obstruction from flue, from
outlet pipes and from air inlet
• check working pressure to boiler
• Check the wiring or change
the sensor
• Check the wiring or change
the sensor
• Check the electrical system
• Check the electrical system
• Change the P.C.B.
• Fill the system
• Check the sensor
• Check the fill loop not passing
• Check the safety valve
• Check the expansion vessel
• Check the wiring or change the
sensor
• Check the wiring or change the
sensor
• Check the wiring or change the
sensor
• Check the wiring or change the
sensor
• Check the wiring or change the
sensor
• Check the wiring.