The burner will not light, smell gas and sparks but not fire.

SOURCE: ignitor click and sparks, but no flames

there are two small holes at the base of the burner where the pipe goes up to it but doesn't touch. i had the same problem and it turned out that these two holes were clogged. i just straightedend a paper clip and solved the problem

SOURCE: old Thermador cooktop continues to spark even after turned off

sounds like you have a bad switch. maybe on the large burner.. some of those switches can be replaced without the whole harness.

SOURCE: Jen-Air Gas range Igniter keeps clicking but not starting fire

01/26/09 My wife decided to give our Jenn-Air a good cleaning. With lot's of soapy warm water she pulled the knobs off and washed under each of them not realizing excess water was now running down the inside of each control knob shaft. The igniter immediately began clicking away as it was being shorted by the conductance of the water now inside of the switch. I had to remove the cover (2-screws) to access the control switches but that is all I needed to do do in order to have clear access. Using her hair dryer it took about 5 minutes of warm air blowing down each of the shafts until the water evaporated and the clicking stopped. Wahla. The old Jenn-Air is back to working order again.

SOURCE: I have a jenn-air sealed gas cooktop jcg8430 only 1 burner lights

you have a problem with the ht leads or spark electrodes

SOURCE: turn on one burner, second burnertrise to light

hi.gud day...tnx for question.im gerbee here in the phillipines, the problem of the the unit is have an dirt or water,& oil coz why the unit is not stoping cliking sound.the best thing to is clean the area were the problem it is,first unplug the unit & turn in off the gas line for the safety..get the vacium & bottle of thinner...first remove all the knobs of the control valve(make sure to remember how to remove the knobs coz if turn back as how you remove it). then drops some thinner located on valve switches(knobs position) 5-10ml,,,then put the vaccium in the place were u drop the thinner to suction the thinner,oil & some dirt.try 2 times for good result...after this if is not work n nid to call an expert tecnician to dismantle & clean the micro swicth one by one(no nid to replace the parts)
tnx gerbee