Furnace repair Furnace igniter would light, no flame. Gas valve is getting 24 volts. Wired gas valve directly to 24volt transformer to discover the gas valve is defective. Replaced gas valve and gas valve would partly open. Wired new gas valve directly to 24 volts and gas valve would open. Ensured gas valve was getting 24 volts and then inspected control board and found a small burn mark. Control board will require replacement as well. Customer is going to receive quotes on a new furnace.