Ferroli
Incorrect Control Algorithm / PID Settings
Thermostat shows large temperature swings; room feels alternately too hot and too cold.
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Possible Causes
Thermostat set to simple on/off instead of modulating mode for compatible Ferroli boiler, Hysteresis set too wide, Underfloor heating controlled like radiators, Poorly tuned weather compensation curve
How to Fix / Troubleshooting
Safety first: Control adjustments only.
- Enable modulation:
- If your Ferroli boiler supports OpenTherm/BUS, set the thermostat to modulating mode instead of on/off.
- Adjust hysteresis:
- Reduce the on/off differential to 0.3–0.5 °C for more stable temperature.
- Optimize for system type:
- Select the correct system type (radiators vs underfloor) in the installer menu.
- For underfloor, use lower flow temperatures and slower response settings.
- Tune weather compensation:
- Adjust the heating curve slope and offset based on comfort feedback.
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Repair Difficulty
Easy
2/5
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