Weil McLain gas boiler (pilot light)

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Old 10-31-09, 10:02 AM
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Weil McLain gas boiler (pilot light)

We have a Weil McLain gas boiler (CGA Gold), a HoneyWell gas valve and a Effikal RVGP draft
Vent. I noticed yesterday that the pilot light is erratic at times, normal then races a we bit,
where the flame gets a slight surge every 10 20 seconds etc. wondering what could be
causing this. everything else works fine, this happens just at idle.

Maybe someone out there has seen this before, I was thinking maybe draft coming down, or
thermocouple beginning to go, maybe some kind of an adjustment or something, but I see no
adjust and the flame looks a good blue. Its around 4 yrs old. I thought it was pilot less and
like a idiot I never turned off the gas valve during the summer.
 
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Old 10-31-09, 10:08 AM
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Odds are the pilot burner needs to be disassembled and the pilot burner and pilot orifice cleaned. Some pilot orifices need to be replace because they can't be cleaned properly.
 
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Old 10-31-09, 11:00 AM
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This does not have an intermittant pilot system set off by a sparker? It doesn't have the orange spark plug wire coming off the Honeywell, on down to the pilot area? If not, it must be pretty ancient. We have a few Weil-McClain boilers that are getting antique, and even they have either HSI or intermittent pilot.

If it did, I'd say, besdies what SP says - to also check to see if voltage quivers between PV and PV/MV(common), on the gas valve, when the pilot comes on. An analog test meter would be better for such a test.
 
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