A bump test was not completed. In order to complete a true bump test you would enter user mode (hold air and press power mode). When in user mode use the air button to scroll to "bump test" then begin the bump test by pressing power mode again. This will bump test the unit and should show a P for all 4 gases.
A bump test was not completed. In order to complete a true bump test you would enter user mode (hold air and press power mode). When in user mode use the air button to scroll to "bump test" then begin the bump test by pressing power mode again. This will bump test the unit and should show a P for all 4 gases.