some LP burner tubes not lighting

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Old 12-22-16, 08:53 AM
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some LP burner tubes not lighting

I have a Weil-Mclain HE-4 series 3 boiler. Intermittently (!) only the first of 6 burner tubes lights. The flame sensor is on tube # 2, when there is no flame on tube 2, the sensor shuts gas off, (as it should.)
T-stat is working fine, hot surface igniter is working fine, (lights first burner), Flame sensor works fine, (shuts off gas if no flame). I pulled the 6 burner tubes, cleaned them, reinstalled, no joy. There is no crossfire tube or mechanism. The burner tubes have no 'wings' for lighting adjacent burners. What's next?
 
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Old 12-22-16, 10:54 AM
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Did you clean the orifice? That would be next step. Then a check of gas pressure.
 
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