F20
Ferroli
Frost Protection Logic / Sensor Fault
Thermostat shows F20 and the frost protection function cannot be enabled or is malfunctioning.
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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
Internal NTC sensor out of calibration, Incorrect frost protection temperature configured, Firmware bug in frost mode, External sensor reading conflicting with internal sensor
How to Fix / Troubleshooting
Safety first: Frost protection is critical in cold climates to prevent pipe damage.
- Verify frost settings:
- In the thermostat menu, ensure frost protection is enabled and set to an appropriate temperature (e.g., 5–8 °C).
- Check sensor readings:
- Compare the thermostat's displayed temperature with a reliable thermometer nearby.
- If there is a large discrepancy, the sensor may be faulty.
- Disable conflicting sensors:
- If both internal and external sensors are used, test frost mode with only the internal sensor enabled.
- If F20 persists:
- Replace the Ferroli smart thermostat if the internal sensor or frost logic is defective.
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Repair Difficulty
Medium
3/5
Required Part
Ferroli Smart Thermostat Room NTC Sensor
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