I bought a house that has a 2009 Sundance Hamilton hot tub. This is my first hot tub, and unfortunately it has an FL1 error code that appears sometimes immediately after restart or sometimes after several minutes--one time it heated all the way to 100 degrees before displaying the FL1 error.
I hired a hot tub repair person to fix it. He doesn't seem to know what the problem is. After the error code started and before he looked at the hot tub, I drained and cleaned it. I put in new filters. I don't think I caused an airlock problem refilling it. The repair person doesn't think that is the problem either. He replaced the flow switches. The repair person said I should replace the circulation pump. It runs, but he said it might just be overheating at times causing it to shut off and thus the hot tub displaying the FL1 error code. He wants to charge $350 plus labor. A new circulation pump only costs $160.
As I noted, the FL1 error doesn't appear at any consistent time. Do you think the problem is the circulation pump? Or is it more likely the circuit board?
Thanks for any advice you can provide.