F02
Ferroli Temperature Sensor Fault (Generic)

Boiler displays F02; may be associated with NTC sensor faults depending on model.

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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

Defective NTC sensor, Short or open circuit in sensor wiring, Incorrect sensor fitted, PCB sensor input failure

How to Fix / Troubleshooting

Safety first: Turn off power and allow the boiler to cool before touching sensors or pipework.

  • Reset: Perform a reset. If F02 returns, a hardware fault is likely.
  • Engineer checks:
    • Identify which NTC (flow, return, or DHW) is referenced by F02 in the specific Ferroli model manual.
    • Measure sensor resistance and compare to the temperature/resistance chart.
    • Inspect wiring and connectors for damage or corrosion.
    • Replace the faulty NTC sensor or PCB as required.
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Repair Difficulty

Hard 4/5

Required Part

NTC Temperature Sensor
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