Do you mean the burner ignites and then goes out when you remove your finger from the control button?
If so it means you need to replace a thermocouple.
To replace the thermocouple depends on which burner is effected and make of cooker.
Eric
July 2009
I can answer this question...
how can i fix my cooker know it dosnt stay in it lights up ok then it goes ?
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Try fixfault.com to fix gas cookers.