I Have A 15 Yr Old Heil Propane Furnace.it Frequently Backfires On
One Or Two Burners When Startup And Will Have Flame Pulsing Inside Burners As Well As Flame Out Normal Area.i Have Replaced
Cross Lighter Bar And Gas Valve.all Burners Are Clean.gas Psi Has
Been Confirmed To 10.wc.furnace May...
