If the filtration does not work and the whirlpool is still under warranty, make a complaint at your dealer. If the product is no longer under warranty, the filter pump can be replaced
You may also check the ceramic axle and impeller inside the pump for damage. These parts are sold as spare parts and can be replaced.
Example of a damaged rotor (impeller) in a pump.

 

For example, if there is excessive calcium in the water, which clogs the pump, the pump needs to be cleaned.

If the filter pump (filtration) does not work, neither does the heater and the saltwater system (sanitation) as the filter pump does not pump water out of the whirlpool, thus there is no circulation.