My furnace is one year old. 90% eficient Concord. PVC exhuast. BLower keeps running but does not ignite. This is happening more frequently. Weather seems to be a factor. Excessive winds; etc. Had a furnace guy out and he said pvc pipe to high. Changed that and it seemed to work better for a while. Tonight I have to hit reset every hour. Otherwise blower keeps running and never ignites. It has never been this bad.