Posted 1/4/2016 05:34 (#5009476 - in reply to #5009462) Subject: RE: Lennox Furnace ?
Is this an lp furnace that has a blower that blows air into the combustion ignition chamber? The humming motor, that motor? If so, check start, run capacitor. Daughter had one go bad several years ago. No air pressure, gas valve will not open.