If you have noticed a reduction in circulation or heating or are getting error codes, there are a few things you can do to troubleshoot.

Any blockage in the system (at the ports, within the connector hoses, or inside the PCU) will reduce flow throughout the entire spa.

Make sure all THREE threaded plastic caps have been removed from the ports on the inside of the tub
Ensure that the spa is on level ground. If not, the weight of the water will not be dispersed evenly around the spa

Indicator: Liner pulling down into the tub on one side.
Check the Intake (x2) and Discharge Ports for any obstructions in the openings (i.e. leaves, twigs, etc)

Check that the connector hoses are straight and level (should resemble the photo below)
Check that the connector hoses are not kinked or twisted (see below)

Unzip the liner and check inside to see if the hoses are kinked (reach inside to feel if the end of the hose is not visible). 
When tightening connector hoses, turn the black split-nut threads on the ends instead of the tubing.
Check the filter. We recommend cleaning the filter regularly and inserting a new filter every 2-4 weeks
It would be a good idea to change your filter sooner if you use the spa frequently.
Simply cleaning and reusing the same filter will not suffice. New filters can be purchased directly or through our retailers.*
Make sure that the spa water reaches the minimum water level lines

Purge air from the PCU to remove an air lock by following these steps:

1. Turn OFF or unplug the unit.

2. Unscrew the air purge valve (flower-shaped knob) counter-clockwise. You should hear a hissing sound then see water come out.

3. Bleed filter housing until water escapes and no more air, tighten back up.

4. Turn on Filter mode and check for circulation at discharge port in tub.

NOTE: If there is an internal issue (broken pump impeller, etc), these solutions will not resolve the issue. 

If you have performed all of the troubleshooting above and are still experiencing a lack of flow, please contact Customer Service for the next steps.

*Available to customers in Canada, the US, and the UK.