Nick6015

Thank you @RDspaguy

Display behaves normally — displays Pr unless I abort Priming stage by pushing either temp button. That interrupts the on/off cycle for a moment, then it starts cycling again. I did some more troubleshooting… the cycling stops when I unplug the top side controls. With each unplug/plug in, the affected pump changes to the next speed: circ/low/high. Does that indicate top side needs to be replaced?

Tub is 2010 Master Spa Twilight Series 6.2, board is Balboa MS1600H4

Hi All - As described, the main pump of my just-filled tub is cycling on and off upon initial start up. Something on the circuit board is also clicking. Any ideas? Thanks in advance!