How to Fix / Troubleshooting

Safety first: Control adjustments only; do not open the boiler.

Review heating curve:
- Lower the slope and/or shift of the weather compensation curve in the thermostat installer menu.
Check outdoor sensor placement:
- Ensure the Ferroli outdoor sensor is on a north or north‑west facing wall, away from direct sun and heat sources.
Set flow limits:
- Configure reasonable minimum and maximum flow temperatures to prevent excessive boiler output.
Monitor and fine‑tune:
- Observe comfort and gas usage over several days and adjust the curve gradually.

Thermostat shows correct room temperature but boiler flow temperature is much higher than expected for weather conditions.

Possible Causes