F11
Ferroli Flow NTC Short Circuit

Boiler shows F11; often indicates a flow temperature sensor short 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

Shorted NTC sensor, Moisture in connector, Damaged harness, PCB fault

How to Fix / Troubleshooting

Safety first: Turn off power and allow the boiler to cool.

  • Engineer checks:
    • Disconnect the flow NTC and measure resistance; if near zero ohms, replace the sensor.
    • Inspect connector for water ingress or corrosion and dry/clean as needed.
    • Check wiring for shorts to other conductors or chassis.
    • Replace PCB if the fault remains with a known good sensor.
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Repair Difficulty

Hard 4/5

Required Part

Flow NTC Temperature Sensor
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