Hayward Super II 2 speed pump 230V to Balboa 2001EL spa pack

Pump starts and stays only on high speed.

Swapped Hi and Lo wires (red/black). Same problem.

Swapped Pump for jet pump (2 speed). Same problem.

How can I get my motor in low speed?

Be sure you are swapping the correct wires. If you swap the high and low wires and still have only high speed, you have both a motor and controler wired wrong. I don't believe this would be the case however. It sounds like you may have switched the l2 and high instead. In any case, I would suspect your control panel is not switching to low speed operation.

Thanks.

FYI:
I took my Hayward super II pump motor assembly to a motor specialist.
They tested and said motor switch was bad.

Interestingly they said mechanical (2 speed) switches need frequent replacement compared to electronic ones. My pump runs 24/7 as needed all year round because I have an indoor swim spa. They said that the replacement motors do come with electronic switches.

At first I thought the controller was wired wrong too so I connected my jet pump to the circulation pump and the controller worked on both speeds.

hmm... a 2 speed pump using a mechanical switch inside to go from one speed to the next? That's a new one on me.

Every two speed motor I've encountered has dual windings, one for high, one for low. The only switch I've seen in any motor is the cintifigual switch that disengages the capacitor after the motor reaches 70% of it's rotational speed. That is for the split phase needed to get the motor running. The split phase winding is yet another additional winding that is wired 90 degrees out of phase with either of the two speed windings. Some newer motors indeed use a current sensing switch to disengage the split phase winding, but I will say this much, our experience with them is that they don't last nearly as long as a mechanical switch in our application. As a matter of fact I had to change yet another one today.

Perhaps what the motor shop meant was that the centrifigual switch to disengage the start winding was bad. That is a cheap and easy repair.