Hi, I have this 1999 model year L A Spa model 150 that has stopped working after a close lighting strike . The digital display flashes OH all the time. have investigated to the point of not knowing what the temp sensor or the over limit sensor are supposed to read in their ohms. they both read 1400. Or have I the problem that is a required board replacement to fix? help. THANK YOU.

i would suspect the over limit sensor, and the way the temp sensor reads, that may be faulty as well.

My Spa had to OH display flashing, our problem was the water go too hot with the high temps we had. we drained it a bit and put cold water in it that worked. Our problem was simple I am not sure about yours.
Good luck