I have a jetted tub in our master bathroom. It has SSWW on it. I gather its higher end, from china and I cannot find a manual or actual model number. It works jets, lights, radio everything without issue. My problem is when it is off for about 10-15 min the motor begins to hum..I don't know what to even look for to find out what's wrong or what i should do. Until i figure it out we use it without the jets or I unplug it immediately after use.