I have a JGP636 or 960. One burner won't \r\ndo

When you turn the burner knob on does the igniter click and turn off on it's own when the flame ignites? If it does then it has flame rectification. That means it can sense when the flame is on. Or does it click when the knob is in the light position and not stop until you move the burner knob? Then this is standard ignition. If it is standard ignition it sounds like it is the igniter switch built into the burner knob might be defective. Are you able to turn on any burner knob and when they are in the igniter position do all the electrodes spark or just the burner that you are turning on? If they all come on then they are wired in a series. If they are wired in a series do you get a spark at the electrode of the problem igniter? If so you can turn on one of the other burners to ignition position then while it is clicking turn on the problem burner to light it. If the cooktop uses flame rectification then there may be a problem with the switch built into the burner knob or the flame rectification sensor for that burner might be bad.

change the spark module...before you do that take the wire from the burner thats not working and switch with different burner at the spark module located at the back...if still not working you might need igniter order at searspartsdirect.com