Be sure bottle with liquid is securely pressed into place with a “click” and not using any oil based cleaning solution. Activate the trigger several times. If the ProMist still doesn’t spray, the nozzle may be clogged. Unscrew and carefully remove the red nozzle located just below the refill bottle. Rinse the nozzle under warm water until nozzle is clean. It may be necessary to soak the nozzle or bottle in hot water.