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Thread: Hayward H400 heater "LO" massage appeared

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    Hayward H400 heater "LO" massage appeared

    My Heater hayward h400 appeared "LO" indicator in the LCD. the manual says that is apperaed because the limiter.
    what should i do to fix it?

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    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Hayward H400 heater "LO" massage appeared

    Open the front panel and look inside, directly in front of you should be two little button looking items side by side with wires attached. Here is what they look like:

    See the one with a small button in the middle of it and a red looking ring? Push it in with your finger or something. Once you do, then get your pump running and turn on the heater. If the unit fires up, then that was the issue. More then likely if that was the issue the unit is getting too hot inside and the most likely cause of that is a sooted up heat exchanger.

    Let me know if the reset of that item works and then I can tell you how to look for a sooted up heat exchanger and how to clean.

    A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you.

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