I have a 2 pump system and the 1st pump just hums for a few seconds and then shuts off when activated by the buttons or the automatic cycles.

I can turn the shaft with my fingers freely.

The controller alternates between FLO and temp display and my owners manual says the FLO error could be plugged filters or a bad pressure switch (I've cleaned the filters and removed them and still the same symptons).

Should I replace the pressure switch?

or start looking at the motor? capacitor?

Thanks

Capacitor/Motor.

Replaced capacitor - still no luck. I guess I'm looking at a motor next?

Yes for sure.