I have a Spa with a VS 501Z Balboa spa pak. I fill up the water and then turn on the spa from breaker. It goes thru the primer mode then kicks on the low speed motor pump. It runs for about 15 minutes and then comes up with the Low Flow or Dry etc. This Spa pak is 8 months old and all worked prior to shutting down for the season. I thought it might be air lock but when I turn blower motor on and the 2nd speed of the jet motor jets blow lke crazy. Disconnected all connections and checked for some obstruction but cant find any. I als checked the 2 pumps to see if there is anything stuck in there. The impellers spin freely. Any ides would be greatly appreciated.