F01
Ferroli Flow Sensor / Circulation Fault

Boiler shows F01 and will not operate; often indicates a flow sensor or circulation issue on some 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

Blocked flow sensor, Faulty flow switch or turbine, Airlock in system, Pump not running

How to Fix / Troubleshooting

Safety first: Allow the boiler to cool and isolate power before accessing internal components.

  • Check system pressure: Ensure pressure is within the correct range and top up if needed.
  • Bleed radiators: Remove air from the system to restore proper circulation.
  • Engineer checks:
    • Inspect and clean the flow sensor or turbine assembly.
    • Verify pump operation and replace if not circulating.
    • Check wiring to the flow sensor and PCB.
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Repair Difficulty

Hard 4/5

Required Part

Flow Sensor / Flow Switch
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