Question about Hayward H400FDP Low NOx Propane Gas Pool or Spa Heater
For informational purposes...
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.
Posted on May 25, 2015
Low flow. Try cleaning the filter.
Posted on Nov 02, 2013
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Posted on Jan 02, 2017
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