Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater

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Ld400 starts and runs for 5or6minutes then shuts down starts to relite right away but when it lites the main burners it shuts down . i replaced the hi and low limits ,checked the flo regulator in the manifold its ok put in a new ign control but still does the same thing.all the wireing looks good because the heater is inside. it was built in 2003. its a laarslite2 low nox with analog heat controls. alsoi trieda new thermister and still the same.HELP!!!!! BOB BoBs pool service Los Angeles

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Check the flame sense wire at burner or curcuit board

Posted on Jan 31, 2010

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