Thermostat calls for heat but furnace short cycles (turns on and off frequently)

Safety: If the furnace is shutting down on safety limits, have it inspected by a professional.

• Check thermostat location: Ensure the Honeywell Home thermostat is not directly above a supply register, near a space heater, or in direct sunlight.
• Adjust cycle rate: In the installer settings, reduce the heat cycle rate (CPH) to a lower value recommended for your system type.
• Replace air filter: Install a clean furnace filter to prevent overheating and limit switch trips.
• Monitor operation: After adjustments, observe several heating cycles. If short cycling continues, the furnace may be oversized or have a control issue requiring a technician.