Found this bad primary on a Goodman yesterday.
Changed it out today...manufacturer says this is "metal fatigue"
Ok I have seen many ring poppers before but not a failure like this.
Temp rise and manifold all to spec. Good static too.
1996 GMPN series
Three seperate cracks.
Can hear the broken pieces rattle when you move the heat exchanger around
Anyone else seen a failure similar to this?