F34
Ferroli Low Mains Voltage

Boiler displays F34; typically indicates low mains voltage on many Ferroli models.

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Safety Warning

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.

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Possible Causes

Supply voltage below minimum, Loose supply connections, Undersized wiring, Internal power supply fault

How to Fix / Troubleshooting

Safety first: Electrical testing must be done by a competent person.

  • User checks: Confirm the boiler's fused spur is firmly plugged/wired and switched on.
  • Engineer checks:
    • Measure mains voltage at the boiler; if low, advise customer to contact an electrician or supplier.
    • Inspect internal terminals for loose or overheated connections.
    • Test PCB power supply; replace PCB if defective.
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Repair Difficulty

Medium 3/5

Required Part

Main PCB (Power Supply Section)
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