No error code @ control board. Made call for heat; trial for ignition completed but stopped within seconds. Checked flame sensor. Cleaned flame sensor. Cycled furnace twice. Flame recitification circuit. 1.6uA. Checked filter. Checked capacitor. Checked wiring. Cycled furnace 3 times and allowed furnace to run long enough to satisfy call for heat. Combustion/draft test: Good Furnace is operating well at the time of this service.