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I had a different issue occur where the motor would no longer turn on. It would attempt to start, the shaft would do a revolution but immediately stop. I bypassed the controller and the motor worked fine so the issue was with the controller. I decided to try and build my own controller instead...

I recently fixed a friend's tub which had the same issue and we didn't drain it. You only have to disconnect the air line going to the control panel. Undoing the little rope around the bottom of the motor unit cover was the hardest part.

The capacitor fix is still working great for me. I didn't test any other capacitor sizes. Different sizes will smooth the signal more/less. Since the 25v 10uF one has about 3 months of testing on my tub I'd use that one.

I used a 25v 10uF just because that's what I had on hand. Works perfectly still, haven't had a single issue.

I just got a second hand Softub 220 (C-2013 board) with this same issue. Tub would do initial heat up fine but when it's around target temperature, it would turn on for a short time, then off, and repeat maybe every 15-30 minutes. The digital temperature indicator on the controller would...