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Background: I have a freeflow tlx with Balboa 54115 Board set to run on 110v. I got it used and not working. I think the guy i got it from got it broken from someone else and couldn't fix it. This is my first experience with a spa. After consulting the wiring diagram, correcting some reversed wires and calibrating the pressure switch, all seems normal. The real problem was poor job of replacing the onboard fuse leading to intermittent board function which i repaired. Question: In a state were its below temperature set point: when I switch the pump to high speed, it stops calling for heat. Returning to low speed, it calls for heats again. Is this normal? Theories: 1. The higher flow rate may be faulting the pressure sensor. 2. Something else is wired wrong. (I found several incorrectly wired connectons to the control board. Its almost like this guy was just trying everything or someone sabatoged it.) 3. Some circuit is fried on the boad because of the situation noted in number 2. 4. Its normal operation for this contoller to cut the heat in high jet mode. Thanks in advance for any advice. -Jim