Series AA250
Page 20
LT252 Oct 2019
Remove these two (2)
screws to take off the igniter
IGNITER & FLAME SENSOR ASSEMBLY
Remove the sensor and igniter from the mounting bracket by unscrewing the two screws on each side. Clean the
sensor rod with steel wool or emery cloth. Rub briskly to remove build-up of dust, dirt and oxide. Check the flame
sensor’s insulator base for cracks. If cracks are found, replace the igniter/sensor assembly.
Perform an ohm check at the ignition control terminals to verify the circuit integrity of the igniter. The ohm reading
should generally be in the range between 50-55 ohms.
Check the position of the igniter/sensor when it is re-installed on the burner. The igniter should not touch the burner
mounting plate but it must still be a ½” (13mm) inside the flame.
Figure 10 – Igniter assembly
Figure 11 – Recommended igniter position
