Ferroli furnace does not respond to room thermostat changes; temperature overshoots or undershoots.

Safety: Turn off power before altering control wiring.

Steps:

• Check thermostat settings: Verify mode (heat), schedule, and setpoint.
• Relocate thermostat (if possible): Avoid direct sunlight, draughts, or proximity to radiators.
• Inspect wiring: Ensure connections at both thermostat and furnace match Ferroli wiring diagrams.

Professional help: For advanced controls (OpenTherm, modulating), a technician should verify compatibility and configuration.