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I didn't really see voltage fluctuation but it happens so quick and my meter doesn't respond instantly, especially in -25C. There is no pilot on this so it just opens the valve and starts the ignitor...

Its a Grandville actually. Same thing though. I haven't used that photobucket account in ages hence all the BS in there.

Every time I connect a manometer I cant reproduce the problem. It appears...

Unit: Lennox GCS16-411-100-1P Packaged rooftop

So the burner on this rooftop unit keeps cutting in and out when it first starts. I inspected the heat exchanger for any holes but didn't see any;...

Well the contactor can only be energized from a few sources. Either the secondary limit (TCO2) is energizing it; in which case the switch is either overheated or stuck; or the economiser is calling...