Ferroli MAXIMA 35 C Instructions For Use, Installation And Maintenance page 29

Maxima 35 C
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
External probe fault
F39
Incorrect system water
F40
pressure
Pressure sensor fault
F41
Return sensor fault
F43
Return sensor fault
F44
Flue gas sensor fault
F45
Flue gas fault
F46
Probe pressure fault
F47
Possible cause
• Software operating fault
• Ionization electode fault
• Flame instable
• Gas valve Offset fault
• Air inlet/flue outlet pipes
blocked
• Air-trap blocked
• 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
• Sensor damaged or short-
circuited
• 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 interrupted
• Sensor damaged
Cure
• Cut off and restore the electricity
supply. If the trouble remains,
check and/or change the main P.C.B.
• Check ionization electrode position
and eventually replace it
• Check the burner
• Verify Offset setting to the minimum
power
• Take blockage off the chimney, flue
outlet pipes and air inlet pipes
• Check and eventually clean the air-
trap
• 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 wiring or replace the
sensor
• Check the fill loop not passing
• Check the wiring and sensor
• 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
• Replace the sensor
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