Honeywell Q3400A ignitor

vulcanram

<P>I am working on a old Heil gas furnace and it's not heating.&nbsp; The ignitor sparks and only lites the pilot area, the burners never try to start. I am not familiar with this type of ignitor, I tried cleaning the flame sensor but didn't correct it.&nbsp; I figure it needs replacing. Any ideas.&nbsp; Btw, once the pilot area is lit, in a little while the blower comes on as if the unit is working properly.&nbsp; Since this happens I figure the limit switches and everything else is working properly.&nbsp; I did check the limits and seem to be fine.</P>