Just finished flushing the tank. That all went fine. Turned on the electric and gas and fired it up. The burner lit and we closed up the area. The burner stayed lit for about 10-15 minutes and went out. The system tried to ignite the burner and it lit for about 5-10 seconds and went out. It kept on doing this, so we turned the thermostat down to vacation level so that it would stop trying and the fan could shut off. Hoping we can rule out sediment problem, if that was a consideration.
Question still remains….no what do we look for?