What is a common sign that a fire extinguisher needs maintenance?

A common sign that a fire extinguisher needs maintenance is when the nozzle is clogged. A clog can prevent the extinguisher from discharging properly during a fire emergency, thereby compromising its effectiveness. Regular inspections should check the nozzle for any blockages, as this can impede the flow of the extinguishing agent when it is needed most.

While a faded label may cause confusion about the extinguisher’s type or usage instructions, it does not directly impact the extinguisher's operational capability. A pressure gauge in the green zone indicates that the extinguisher is properly pressurized and ready for use, which means it does not require maintenance in this regard. Lastly, secure mounting is a positive sign; it ensures that the extinguisher is easily accessible and unlikely to be damaged, thus not indicating the need for maintenance.