Troubleshooting - Ferroli Optimax 25 C Instructions For Installation, Use And Maintenance Manual

Optimax 25 C

3.4 Troubleshooting

Fault Diagnosis
In the event of operating problems or trouble, the display will flash and a fault identification code
appears.
There are faults that in order to restore operation the RESET button must be pressed (ref.2 - fig. 1); or
if the boiler fails to start, it will be necessary to repair the fault (code nos. F1 to F24). Other faults cause
temporary shutdowns that are automatically reset as soon as the value comes back within the boiler's
normal working range (codes from 25 to 47).
When the boiler starts functioning normally again, the display stops flashing and the fault code disap-
pears.
Table 6
Fault
F1
No burner ignition
F2
flame detected with the
burner off
F3 100°C Safety thermostat trips
F5
Fan problem
F8 No flame after the ignition
phase
F9
No communication between
the CVBC and the
gas valve
F10
Microprocessor trouble
÷
F22
Possible cause
• No gas
• Detection or ignition
electrode fault
• Defective gas valve
• Incorrect inlet gas pressure
• Siphon obstructed
• Ionisation electrode
defected
• Main board defected
• Flow sensor not active
or correctly located
• No system circulation
• Tachometer signal
interrupted, fan connection
• Fan damaged, debris in fan
• CVBC fault
• Ionisation probe fault
• Mains interference
• Incorrect wiring
• Damaged valve
• Microprocessor operating
trouble
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 and fan
• Check the fan, clean debris
• Check and if necessary change
the CVBC
• Change/clean ionisation probe
• Check the earthing
• Check the wiring
• Check the CVBC
• Change the valve
• Cut off and restore the electricity
supply. If the trouble remains, check
and/or change the main PCB
27