is your coal burning ?
-try blowing on it till its fully lighted (orange)
-make sure you're hookah has no air-leaks
-make sure you foil is perforated , not touching the tobacco
, and closing the bowl of exept where the coal is
-make sure you're tobbaco is fresh/wet not smoked before (honey it if necceseary)
-make sure you're "one direction vent" is working (closed if you pull)
hope that helps