Ferroli OPTIMAX 25 OV Instructions For Use, Installation And Maintenance page 29

Wall-mounting, pre-mixed condensing gas boiler
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Optimax 25 OV
Fault
F25
Software fault
No flame after the ignition
F26
phase (5 times in 4 min.)
F30
Flow sensor fault
F31
Flow sensor fault
F34
Supply voltage under 190V.
or over 250V.
F35
Irregular mains frequency
F36
Electronic PCB trouble
F37
Incorrect system water
pressure
F43
Return sensor fault
F44
Return sensor fault
F45
Flue sensor fault
F46
Flue sensor fault
Possible cause
• Software operating fault
• Detection electrode faut
• Flame instable
• Incorrect valve gas Offset
• Flue gas circuit obstructed
• Siphon obstructed
• Sensor damaged or short
circuited
• Sensor damaged or wiring
broken
• Electric mains fault
• Electric mains fault
• Wiring broken
• Sensor damaged or wiring
shorted
• Sensor damaged or wiring
broken
• Sensor damaged or wiring
shorted
• Sensor damaged or wiring
broken
Cure
• Cut off and restore the electricity
supply. If the trouble remains,
check and/or change the main CVBC
• Check that the electrode is correct
positioned and is necessary change
it
• Check the burner
• Check Offset at the minimum power
• Check if flue gas circuit is free
• Clean and if necessary change the
siphon
• Check the wiring or change
the sensor
• Check the wiring or change
the sensor
• Check the electrical system
• Check the electrical system
• Change the electronic CVBC
• Check connection betwenn 5-8
terminals of X7 on the display board
• 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
29

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