We set up our hot tub yesterday. The error codes HD, Flo, and HL, at individual times, of course, were showing. My husband had the idea that perhaps the water level was a bit high and he drained some water. We installed new filters. After that, all was fine. I enjoyed being in the tub, for the first time this year. Now, today we turn it on again and the error codes are showing again and we don't know what to do. Several times, we tried shutting off the electricity to no avail. It purges, works for a very short time and shuts off again, with the HL error code showing. I know that others have had some problems with this before and perhaps it's old hat to them, but I need some help!:(