Are the burner head and burner cap positioned properly?
Cap must be seated on the burner base to light and perform properly. Reinstall the burner cap, making sure the alignment pins are properly aligned with the burner cap. The burner cap should fit flush with the burner base and have very little side to side movement. Typical burners shown below:
Burner cap:Always keep the burner cap in place when using a surface burner. A clean burner cap will help avoid poor ignition and uneven flames. Always clean the burner cap after a spillover and routinely remove and clean the caps. Do not reinstall wet caps on burners.
To clean the burner caps:
Clean with a nonabrasive plastic scrubbing pad and mildly abrasive cleaner. Clean as soon as cooktop, grates and caps are cool.
Do not clean burner caps in the oven during a Self-Cleaning cycle.
Do not wash burner caps in the dishwasher.
Be sure the correct burner cap is on the correct burner base. The burner head and the underside of the burner cap may have a mark indicating which burner cap and burner base match. See example below:
When reinstalling the burner cap; make sure the alignment pins are properly aligned with the burner cap as shown below. The burner cap should fit flush with the burner base and have very little side to side movement.
CLICK HERE for a video on Burner Cap Alignment.