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Problem solved! The flame sensor has a small bracket / support for the ceramic insulator sleeve protecting the rod from the bracket. The insulator support must have rusted away allowing the ceramic sleeve to slide down. My guess is that the rod was grounding out on the bracket that attaches...

I replaced the pressure switch and now get the heater to consistently try to light. I observe the HSI doing its thing, a click, and most times I get the burners going along the back for 2-3 seconds and then go out. Three attempts at that and then I cycle the on-off switch. I was going to go...

The biggest performance improvements I've been able to achieve in dealing with my 380 over the years was when I replaced the tires. The low RPM could also be coming from an underperforming booster pump. Do you see any leaks there? I also installed the backup value in the wrong direction once...

Hi All. I have a LD400N natural gas fed heater on my 26k gallon pool. 12th season here in PA. Heater will not startup and stay lit. I suspected the pressure switch because I had to load the loop up with oil last year to get it started, which I did again this year but it did not result in...