skimmer help!!! no micro bubbles

[Amadod2]

Hi everyone, so this week i took my tank apart for a full rebuild when i was doing a clean (the tank was filled with water and bleach) i ran all my gear, my skimmer was running fine. Today i started putting everything back in running condition and when i plugged in the skimmer it's not producing micro bubbles. So it's a SWC 160 and the motor is running and there is nothing blocking the impeller, so the air tube is not blocked. Any ideas???