Troubleshooting - Ferroli OPTIMAX 25 OV Instructions For Use, Installation And Maintenance

3.4 Troubleshooting

Fault Diagnosis
In the event of operating problems or trouble, the display fl ashes and a fault identifi cation code
appears.
There are faults that in order to restore operation the RESET button must be pressed or (ref.2 - fi g. 1);
if the boiler fails to start, it is necessary to resolve the fault (from no. 1 to no. 24). Other faults cause
temporary shutdowns that are automatically reset as soon as the value comes back within the boiler's
normal working range (faults from 25 to 46).
When the boiler starts functioning normally again, the display stops fl ashing and the fault code disap-
pears.
Table 6
Fault
F1
No burner ignition
F2
flame detected with the
burner off
F3
Safety thermostat trips
F5
Fan problem
F8
No flame after the ignition
phase
F9
No communication between
the electronic unit and the
gas valve
F10
Microprocessor trouble
÷
F22
28
Possible cause
• No gas
• Detection or ignition
electrode fault
• Defective gas valve
• Incorrect inlet gas pressure
• Siphon obstructed
• Ionization electrode
defected
• Main board defected
• Flow sensor not active
• No system circulation
• Tachometer signal
interrupted
• Fan damaged
• PCB trouble
• Mains interference
• Incorrect wiring
• Damaged valve
• Microprocessor operating
trouble
Optimax 25 OV
Cure
• Check the regular gas flow to the
boiler and the air has been
purged from the pipes.
• Check that the electrodes are
correctly positioned and free of
any deposits
• Check and change the gas valve
• Check inlet gas pressure
• Check and if necessary change the
siphon
• Check the ionizing electrode wiring
• Check the CVBC
• Check the correct positioning
and operation of the Flow sensor
• Check the pump and radiator valves
present in the system
• Check the wiring
• Check the fan
• Check and if necessary change
the PCB
• Check the earthing
• Check the wiring
• Check the components
• Change the valve
• Cut off and restore the electricity
supply. If the trouble remains, check
and/or change the main CVBC unit