Possible reasons include:

Clogged nozzle: Due to dried residue inside the pump.

Airlock in the pump: Try pumping multiple times to remove trapped air.

Dip tube blockage: Inspect the tube for any obstruction.

Faulty spring mechanism: If broken, the pump won’t reset after pressing.

How can I unclog a mist spray pump?

Remove the nozzle and soak it in warm water or vinegar for a few minutes.

Use a thin needle to clear any buildup in the nozzle.

Pump warm water through the sprayer to clean internal components.