I could really use some help here....I have a 1997 Sundance Spa. I noticed that neither of the pumps would work when the tub is up to the set temperature (usually about 100). The display show "FLOW" when I try to turn on a pump. I shut the tub off, let the water cool for a day and restart it. It works fine getting back up to the set temperature. I was able to get both pumps to work during start up. But once again, once it's up to temp I get the "FLOW" indication. I've tried this twice with the same results. I inspected the motherboard and wiring and did not see anything obvious wrong. Any ideas? I had one thought that it might be the flow sensor but I'm just guessing. I've drained the tub for the summer but I'd like to be ready for the fall season. Thanks in advance, Ed M.