Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1 Logo

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Posted on May 24, 2009
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Error code LO

Just installed, new hayward pool heater H200FD. Keep getting error code LO. What should I check.

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  • Posted on Jun 07, 2009
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Is the heater installed indoors?? if so you'll need a vent pressure orifice kit.
if not check your water press. (below 18 PSI on filter) Place filter on "recir" if it fires and stays on . it's the pressure.
check to see if all connections a set tight hi-ltd switch wire harness etc.

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  • Posted on May 25, 2015
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LO is simply informing you that the Heater is not sensing proper water flow through it! A special sensor, called a pressure switch is this source. But... That does not mean it is bad - No, it is in most cases just doing its job!
Most common reason - Dirty Filter.
A good cleaning of the cartridges, or maybe a breakdown and recharge of a DE Filter, or a good cleansing backwash of your sand filter, will remedy this situation.

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