York 2LA04704633 Low Ambient Sensor

The York 2LA04704633 is an essential component built exclusively for York HVAC systems, primarily gas furnaces. During cold weather, this sensor—also referred to as a low ambient sensor—is essential to maintaining safe and effective functioning. The sensor measures the temperature in the area around the furnace. If the temperature falls below a set point, the sensor notifies the furnace control board. This signal causes the furnace to modify its operation to guard against potential harm brought on by extremely low temperatures. To reduce the chance of internal parts freezing or cracking, the furnace may postpone ignition or turn on burners gradually.