Weil McLain won't light

Jim_67

Just finished all the plumbing and hookups on a new Weil Gold CGa-3-PIDN boiler with a spark ignited pilot system.

All the lights on the control module work fine until it gets to the final light (5th) which is FLAME. The flame light then blinks and then the 4th light which is Damper goes out. The first 3 lights remain on which are 1- power 2- tstat/circ and 3-limit.


The pilot will not light. I do see a spark allthough it is very weak. With the use of a sensit there is gas present at the pilot orfice but the pilot will still not light.

Has any one else had this problem, or have a idea on how to correct this?

klaus

Dbl. check the ground for the rack with the ignitor.

Wouldn't be the first time...

Shane_2

As Mike said, check the ground with the ignitor.
Also check to see if the pilot assembly is in the correct location. (I Have had them shift during shipping and the control does not sense the pilot).

If these suggestions don't help, go to page 43 in the manual, they have a pretty good troubleshooting guide. If you can't find the manual, their website has it available.

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Darrell

Make sure the pilot orifice is for natural gas...seen 'em shipped with LP orifices in place...tiny little flame that won't prove. Make sure the gas valve, (main), is putting out at 3.5 inches. Make sure you have plenty of gas at the pilot. Make sure the gas company is giving you the full pressure they promise. There won't be much spark to see...(but it sure feels like a big spark if you happen to be holding it). Just for kicks, make sure the polairity on the line volt side is correct...otherwise you'll have a situation known in high-ly technical jargon as "stupid control". The flame prover rod has to be in the blue flame...only the blue flame will conduct the current to prove ignition. Light the pilot by hand and see if there is a good flame...this will narrow your search for clues down...if it lights and proves by hand then you have an ignition problem...if it lights but won;t prove then you have a proving circuit problem...if it won't even light by hand then you have a gas delivery problem, (wrong orifice, kinked or plugged pilot line or orifice, mis-adjusted gas valve, etc.) Your gas meter is on...yes?

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World Plumber

Have you purged the gas line? The air the line from working on the system doesn't burn well. Have seen that in the past.