Modern gas ovens have an igniter that provides a spark to light the pilot light. The igniter is next to the pilot light. If your gas oven will not heat when turned on, the problem may be with the igniter. Sometimes the contacts on the igniter can become dirty and may require cleaning. Cleaning the igniter properly requires that you remove it from the bottom of the oven. The entire cleaning process takes about an hour.
Remove the racks from inside the oven. Unscrew the four screws that hold on the floor plate of the oven using a Phillips-head screwdriver.
Locate the igniter, which is the device next to the pilot light.
Unscrew the two screws that secure the igniter to the oven and pull out the wire clip. The igniter is fully disengaged and can be removed from the oven.
Soak the igniter in a small plastic container filled with a solvent. Soak the igniter for approximately 20 minutes.
Take the igniter out of the solvent and pat dry with a paper towel.
Spray the igniter with a can of compressed air to remove any particles that may remain. Reinstall the igniter in the oven by reversing the process you used to remove it.