Possible causes:

• Piston valve is not installed properly.

• Airflow valve is not properly secured and directed upwards.

• Internal seal of air flow valve is clogged.

• The internal seal of the air flow valve is dirty.

• Airflow valve is broken.


Solutions:

• Tighten the piston valve securely or reinstall.

• Tighten the air flow valve securely and make sure it is facing up.

• Switch on the pump and let it work for a few seconds. Then switch off, repeat 3 times.

• Remove the air flow valve, remove the dirt with water and replace the valve.

• Replace with a new air flow valve.