gredd

Thanks for the replies. I have spoken with Dennis of ESP and I think we may have the problem resolved. The folks at ESP are extremely helpful and patient. I highly recommend them.

My 2008 Dimension One Nautilus spa had the "Low Flow" message and no heat. I also did not see bubbles coming from circulating pump. I performed a spa flush, cleaned it up. Installed new filters, replaced ozone bulb. Did all of the steps to purge air. That did not clear the error message and still no bubbles from circulating pump. Called a repair service for inspection. He said the circulating pump was not working even though I heard it working. I asked of I should shut down spa until new pump arrived. He said "no", go ahead and let the pumps filter the water. This morning I saw steam coming from hot tub and the topside panel say's "High Limit" and the water temp showed to be 133 degrees. Yes, the water is extremely hot. I have shut down the spa for now. Has the circulating pump burned up or is this a sensor problem?