Like the title says ... I noticed that my heater outlet is not producing bubbles since I removed a defective ozone check valve (leaking) from my plumbing system. I don't have an ozonator, but the spa had this valve installed and it was leaking bad.
The heater works fine and there's hot water coming out of the outlet, but no bubbles. I just had an FL1 error that I just cleared a few days ago.
Any help is greatly appreciated.