F20
Ferroli
Return NTC Open Circuit
Boiler displays F20; may indicate a return NTC 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 return NTC, Broken sensor, Harness break, PCB sensor input fault
How to Fix / Troubleshooting
Safety first: Isolate electrical supply before accessing sensors.
- Engineer checks:
- Check the return NTC connection and wiring.
- Measure sensor resistance; replace if open circuit.
- Verify continuity of the harness to the PCB.
- Replace PCB if necessary.
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Repair Difficulty
Hard
4/5
Required Part
Return NTC Temperature Sensor
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