This looks like a lovely forum. Recently found my Hot Springs Jetsetter Spa dead with a burn mark on the back of the IQ2020 heater relay board. After a conversation with Watkins I purchased a Whole new IQ2020 controller, only to find that I would need to replace the upper controller head and do some other things to make it work. Yuck. Bottom line - sending it back (even though it seemed like a bargain @ $350 for the entire controller).
Now I’m wondering - is the main controller board really bad? Saw some discoloration on the main board where the hot wire comes in so assumed it was bad. Is there a way to check the main board to check it’s basic functionality, so I don’t fry the future new heater relay board or anything else?