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Okay. I tried jumping each high limit seperately then both and no change. I switched thermister wires and now goes to 97 deg. Anything else to try? I sure hate to spend money on board and doesn't change anything.Thanks again!!

Thanks to both. I'm out of town but will try later. Chris, the voltage in and out of 135 and 150 high limit switches is 12v so I'm assuming they're ok if theyre like a fuse and something disrupts voltage from in to out.

Thanks for input. I'm hoping it isn't the Temperature control assy. Here's manual https://www.parts4heating.com/v/vspfiles/images/pdfs/ESCSeries2.pdf

I have an older Teledyne Laars ESC 400 heater. I have built in hot tub/pool combo. Heater stopped working 5 years ago so was not used. Finally checked myself using test ladder in manual and discovered gas valve was bad. I replaced gas valve and lit immediately. The problem is it wont go to temp...