Furnace short cycles: starts and stops frequently, with only brief heating periods.

Safety: Repeated cycling can stress components; address promptly.

• Check thermostat placement: Ensure the thermostat is not near heat sources, drafts, or in direct sunlight. Relocation may be needed.
• Clean filters and vents: Replace clogged air filters and open all supply and return vents to improve airflow.
• Observe furnace behavior: Note whether the burner shuts off due to reaching setpoint quickly or due to safety trips (e.g., high limit). This information will help a technician diagnose.
• Professional evaluation: If cycling persists, an Ariston technician should check sensor calibration, gas rate, and system sizing.