What is a typical sign that a fire extinguisher requires servicing?

A typical sign that a fire extinguisher requires servicing is indicated when the pressure gauge shows it is below the green zone. The pressure gauge is a crucial component that reflects the internal pressure of the extinguisher, which indicates whether the extinguisher is charged and ready for use. The green zone on the gauge signifies that the extinguisher is properly pressurized, while a reading below this zone suggests that the extinguisher may not function effectively during an emergency. Therefore, maintaining the gauge within the green zone is essential for ensuring the fire extinguisher's reliability and readiness.

Other signs, such as discoloration of the nozzle, coldness to the touch, or a dented casing, may indicate some issues but do not specifically denote that the extinguisher is in a non-functional state. Discoloration could be due to environmental factors, coldness might not affect functionality, and a dented casing could also just be cosmetic. However, the pressure gauge provides a direct assessment of the extinguisher’s operability, making it a more definitive indicator of the need for servicing.