1. The stopper caps are still inside the spa
Remove the black stopper caps from the inside of the liner before heating, filtering or running the bubbles on the spa.

2. Filter cartridges are dirty
Remove the filter cartridge from the filter housing and check it is clean. Please make sure the new filter is clean and dry before you install it.

3. Filter housing is restricting flow

4. Pipes within the liner are kinked or bent

5. Water flow sensors not working
If the above troubleshooting has not resolved the problem, the water flow sensors may not be working.