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

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H400FDN... Lights... burns for 5 secs... turns off... repeats...

H400FDN... Installed July 2008... First time to use heater since last season... Heater comes on, fan starts, ignition lights and give off a nice "poof" of heated air, heater burns for four to five seconds and shuts off, steam comes up through vent.... Cycle repeats every 45 seconds or so...

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Pull your heat tray and clean burners and check for rat nests. A common cause of this is spider webs in the gas orfaces on the supply pipe. If you remove the brass orfaces they may have small,small,small tiny webs inside them oyu can blow out or clear with a toothpic. they dirvet the gas from the main burner (the one with the ignitor) as the gas builds it will poof and start but then the other burners that have gas flow won't be close enough to let the ignitor read flame so it will cycle just like you describe. My kingdom for a toothpic. I have made a tool to do this out of a stripped wire bent just so with the end roughed up to catch the webs so I didn't have to pull the tray on heaters with this proble. You should pull the tray and see the whole problem to understand it better.. I hope this helps and good luck.

Posted on Oct 05, 2009

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