I think thats an electric dryer. Check your fuses/breakers first. Most likely you are only getting one leg of power to the dryer.

Next check your vents to make sure they aren't blocked. You may want to run one cycle without the vent connected to see if it makes a difference in drying.

If you are handy and it's an electric dryer run a continuity check across the heating elements. If you get no continuity, the elements went bad. And sometimes even though the wire looks fine it may not have continuity.