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hey everyone....i went to a no heat call on a KENMORE (DUNKIRK) steam boiler it was installed by a contractor from SEARS....customer was fed up and called my company....besides the horrible steam piping that i would have to fix once i fix this problem i found the boiler carbonized severely with black soot(gas fired)on the right two sections...rollout was tripped ....so i cleaned the whole boiler like i always do and did a CO test in flue ...i got the levels down to 18PPM from 3800PPM....also did a combustion test O2=7 CO2=12 STACK TEMP= 375F DRAFT= -.03.....the problem is with the boiler cleaned im still getting a slight rollout at those sections and the gas is igniting right at the orifice at the gas manifold....gas pressure coming IN with all appliances on is 6" W.C.....and OUT is 3.5" W.C....can the burners be bad???boiler is three weeks old....and when i switch burners it happens with any burner??
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