If the heat anticipator of a thermostat is set too low, what problem may occur during operation?

When the heat anticipator of a thermostat is set too low, it can lead to short cycling of the main burner. The heat anticipator is a critical component that helps the thermostat predict when to turn the heating system on and off based on the temperature. If set too low, the anticipator may cause the thermostat to shut off the heating system prematurely before the desired temperature is reached. This results in frequent on-and-off cycling, or short cycling, of the main burner, which prevents the system from operating efficiently and can lead to uneven heating in the space.

Short cycling can create additional strain on the heating system components, potentially leading to premature failure or increased maintenance needs over time. It's essential for the anticipator to be calibrated correctly to ensure smooth and efficient operation of the heating system, as well as comfort within the space being heated.