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If only the first burner is lighting, you need to check your burners and crossovers to look for dirty burners, burners not in the correct position, warped crossovers, etc.
There could also be a low gas pressure problem and this is checked with a manometer.
The crossover is a slotted opening in the front of the burner that transfers the flame from one burner to the next. These must be lined up and not warped. The burner itself may have dust inside preventing it from lighting properly.
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