Heater wouldn't turn on/respond when turning switch to pool or spa. Jumped the control board and works but continues heating of course.

When not jumped, only power light is on.

When jumped, red service light, pressure, tstat, & aux lights turn on. Service light turns of a couple seconds later. Then after heater turns on, heat light also turns on.

How do i find out which part is broken? The control board or something else?