Ferroli
No Heat Demand from Thermostat
Thermostat does not call for heat; boiler remains off even when room is cold and setpoint is high.
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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
Heating schedule set to OFF or holiday mode active, Thermostat in manual OFF or summer mode, Incorrect system type selected (e.g., cooling only), Internal relay or BUS output failure
How to Fix / Troubleshooting
Safety first: Work on low‑voltage controls only; do not open the boiler.
- Check operating mode:
- Ensure the thermostat is in HEAT mode, not OFF or COOL.
- Disable holiday or eco modes that may suppress heating.
- Review schedule:
- Confirm that the current time period is programmed for a temperature above room temperature.
- Force manual demand:
- Set the thermostat to a high manual setpoint (e.g., 25 °C) and observe if the boiler starts.
- Check wiring/receiver:
- Verify that the receiver is powered and paired.
- If using relay control, check that the relay closes when there is demand (listen for a click).
- If still no demand:
- The thermostat output stage may be faulty; replace the Ferroli smart thermostat or receiver.
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Repair Difficulty
Medium
3/5
Required Part
Ferroli Smart Thermostat Receiver
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