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Before you replace, check the spacing of the points on the ignightor electrode.
Last spring on my way north we had one cold night, Normally we heat with electric but "on the road" we have to use gas.. Next day I pulled the burner assembly out of the furnace and measured the gap at only 2x specification.
Now ... I've not yet had to re-set my water heater gap.. But there are indications I perhaps should.
Furnace at my parents stick house was flakey too.. Till I reset the gap.
Why they can't get it right at the factory.. I don't know.