Optimax 25 S Manual - Ferroli

Optimax 25 S3.4 TroubleshootingFault DiagnosisIn the event of operating problems or trouble, the display blinks and a fault identification codeappears.There are faults that in order to restore operation the RESET button must be pressed or (ref.2 - fig. 1);if the boiler fails to start, it is necessary to resolve the fault (from no. 1 to no. 24). Other faults causetemporary shutdowns that are automatically reset as soon as the value comes back within the boiler’snormal working range (faults from 25 to 46).When the boiler starts functioning normally again, the display stops blinking and the fault code disappears.Table 6F1Fault Possible cause CureNo burner ignition• No gas• Detection or ignitionelectrode fault• Defective gas valve• Incorrect inlet gas pressure• Siphon obstructed• Check the regular gas flow to theboiler and the air has beenpurged from the pipes.• Check that the electrodes arecorrectly positioned and free ofany deposits• Check and change the gas valve• Check inlet gas pressure• Check and if necessary change thesiphonF2flame detected with theburner off• Ionization electrodedefected• Check the ionizing electrode wiring• Main board defected• Check the cardF3Safety thermostat trips• Delivery sensor not active• No system circulation• Check the correct positioningand operation of the delivery sensor• Check the pump and radiator valvespresent in the systemF5Fan problem• Tachometer signalinterrupted• Check the wiring• Fan damaged• Check the fanF8No flame after the ignitionphase• CVBC trouble• Check and if necessary changethe CVBC• Mains interference• Check the earthingF9No communication betweenthe electronic unit and the• Incorrect wiring• Check the wiring• Check the componentsgas valve• Damaged valve• Change the valveF10÷F22Microprocessor trouble• Microprocessor operatingtrouble• Cut off and restore the electricitysupply. If the trouble remains, checkand/or change the main CVBC26