If output pressure not less than 25psi, but no bubble released in the bubble counter.• Check the solenoid. There's click sound when turn on/ off the solenoid. If there's no click sound when power on/off, please contact service@fzaqua.com to replace the solenoid.• Check the bubble counter. Power on the solenoid, and remove the bubble counter, turn up the needle valve, check whether can feel gas realsed from the needle valve outlet. if gas can be released from the needle valve, means needle valve works well, bubble counter is blocked, please contact service@fzaqua.com to repalce the bubble counter.