Ferroli furnace shows F41; ignition may be erratic or absent.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Faulty Ferroli ignition/flame control circuit on PCB, Damaged ignition cable, Incorrect earthing of appliance

Safety: Isolate power and gas. Ignition control faults can cause delayed ignition or flame instability.

Steps:

Check earth connection: Ensure the furnace is properly earthed at the mains connection and that the earth wire is secure.
Inspect ignition cable: Look for cracks, burns, or loose connections on the high-voltage ignition lead.
Reset: Restore power and attempt a reset. If F41 persists, internal PCB faults are likely.

Professional help: PCB and ignition system diagnostics and replacement must be done by a qualified technician.

Professional Required 5/5

Main Control Board (PCB)

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