if the furnace comes on, you may have a flame sensor that needs cleaning.  it's the silver rod looking thing shaped like an "L" in front of one of the burners.  see if you can disconnect it and take a wire brush to it and try to get it back to silver if it's black. if the furnace comes on, you may have a flame sensor that needs cleaning.  it's the silver rod looking thing shaped like an "L" in front of one of the burners.  see if you can disconnect it and take a wire brush to it and try to get it back to silver if it's black.

the ignitor isn't itermittant, it either comes on or doesn't. you may have a control board failure.  if the flame sensor isn't "sensing" the unit will shut down.  do the burners light at all? the ignitor isn't itermittant, it either comes on or doesn't. you may have a control board failure.  if the flame sensor isn't "sensing" the unit will shut down.  do the burners light at all?