F15
Ferroli
Weather Compensation / Outdoor Sensor Communication Error
Thermostat shows F15 and the heating curve or weather compensation does not function correctly.
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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
Incorrectly wired Ferroli outdoor sensor, Wrong sensor type configured in thermostat, Broken cable between thermostat and outdoor sensor, Faulty outdoor NTC sensor
How to Fix / Troubleshooting
Safety first: Outdoor sensor wiring is low‑voltage but may run externally; isolate power before working on terminals.
- Check configuration:
- In the thermostat installer menu, ensure weather compensation is enabled only if an outdoor sensor is installed.
- Select the correct sensor type if options are provided.
- Inspect outdoor sensor:
- Locate the Ferroli outdoor sensor on an external wall.
- Check that the housing is intact and cable gland is sealed.
- Check wiring continuity:
- At the thermostat terminals, ensure the two‑core cable is firmly connected.
- Repair any visible cable damage.
- Replace sensor if needed:
- If F15 persists and resistance tests show an open/short, replace the Ferroli outdoor NTC sensor.
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Repair Difficulty
Medium
3/5
Required Part
Ferroli Outdoor Temperature Sensor
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