Why has my blower stopped working? Holly July 04, 2018 03:53 Updated Follow Please Note: If your blower has failed, one of the main causes is a defective non return valve and you should consider replacing that. It will stop the water from slugging the new blower. Related articles How does a spa blower work? How do I replace my laminar jet foam? What information do you need to replace my blower pump? Comments 0 comments Article is closed for comments.