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I am a newbie to this site but not a newbie pool owner. I have a 21 year old pool that is in excellent shape because I stay on top of the chemical balance as well as the cleaning. I am a 60 yo female DIY'er that has just enough knowledge to be dangerous! The internet and YouTube are my best...

I recently replaced the heat exchanger in my pool heater due to it leaking, easy replacement. After getting the unit back together, I fired it up, it started fine, but would shut down after seconds, sometimes 10 seconds, sometimes 35 seconds, it fluctuated, but it would start back up on its own...