F10
Ferroli Flow NTC Open Circuit

Boiler displays F10; often indicates a flow temperature sensor open circuit 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

Disconnected flow NTC, Broken sensor, Broken wire in harness, Faulty PCB input

How to Fix / Troubleshooting

Safety first: Isolate power before removing the boiler casing.

  • Engineer checks:
    • Inspect the flow NTC connector and wiring for disconnection.
    • Measure resistance of the flow NTC; replace if open circuit.
    • Check continuity of wiring back to the PCB.
    • Replace PCB if sensor and wiring are intact but F10 persists.
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Repair Difficulty

Hard 4/5

Required Part

Flow NTC Temperature Sensor
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