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  1. PoolKiller

    H400 Hayward heater "if" error code after board replacemt

    Re: H400 Hayward heater "if" error code after board replacem Scott (poolguyNJ) Thanks for your post, I tried cleaning out the cobwebs but that didn't make sense to me but with no avail. I cleaned the L shaped heat sensor with some sand paper and my heater now works perfectly. I also have a...