No glow from the ignitor? If not, your not getting power to it. You need to check to see where your losing power. Devices in that circuit are timer, temp switch, hi limit thermostat, thermal cutoff, operating thermostat, thermal fuse, flame sensor and motor switch. You can check voltage at each device to determine where your losing it or you can check continuity of each device. The motor switch would have to be activated manually.

Eric

So your getting 120vac to ground at either terminal of the flame sensor? If yes, and no glow from the ignitor, the ignitor could be bad or your not getting neutral to the ignitor via the motor switch. The motor switch is part of the motor. It is activated by a centrifugal mechanism inside the motor which operates a disc and lever to operate the switch. The two outer terminals of the motor connector (red wires) connect to the internal switch. You would need to check continuity across those terminals on the motor (wiring harness unplugged) while manually activating the switch with a screwdriver pushing against the disc within the motor frame.

Eric