Room too cold even though thermostat is calling for heat; boiler appears to run but comfort is not achieved.

Safety first: No electrical work is required.

• Check setpoint: Confirm that the desired room temperature is set correctly on the thermostat and in all schedules.
• Adjust heating curve: In expert settings, slightly increase the heating curve slope (e.g. by 0.1–0.2) and monitor comfort over 24–48 hours.
• Review room influence: If available, increase the room influence parameter so the thermostat has more impact on flow temperature.
• Relocate thermostat if needed: If the thermostat is in a cold hallway or near a draft, consider relocating it to a representative living area.