Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1
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Lo means low system flow. You usually need to clean you filter system and skimmer basket(s) to get the error to clear and the heater to operate. If it still wont run it means the pressure switch has failed and needs to be replaced.
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Posted on Sep 05, 2010
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Posted on Jan 02, 2017
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