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    Mastertemp 400 service heater and HLS leds on

    Heater has been working fine for past year since fixing gas flow issue (thank you to this forum for helping me troubleshoot and solve that issue). Now I am back for more advice. Heater does not fire and service heater led is on. Immediately after turning on power the PS led comes on, then a...
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    Pentair IC40 and low chlorine level, nitrates?

    I'm having problems this season with the system being able to keep chlorine in range. System is about 3 years old. First year worked great consistently had 2-3ppm all summer with IC40 set at 25%. Second year started out ok but then I had to increase output to 50% to keep chlorine in range then...
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    Pentair mastertemp 400 cycling due to low gas flow?

    Had mastertemp 400 heater installed about 2 years ago pool guy that did the install says this issue with it cycling is because I don't have enough gas flow to the heater. Is there a definitive way to confirm this before I spend about $3000 replacing the gas line? The cycling seems to be worse...