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I have recently replaced the gas valve on my Hayward Heater. The solenoid just failed. I cannot find any major literature on why these fail. This may be a dense question and I am asking more out of my own curiosity. This was a 4 year old valve. Any idea generally why these fail?

Ok, have been lurking and reading a lot. Pretty sure I have had a mustard algae issue. I am on about day 8 of SLAM. I have passed the OCLT test once- 2 nights ago. Am using the 2006C kit from Taylor. My CYA is @ 40 and I’ve maintained FC over 16 for a while. I even had a few days at MA slam...