The dryer has power to it but when I hit the start button the code f1shows?

How about providing more details, such as the brand name and model number of the dryer, to start with.

These driers will do that when the lint builds up like concrete on the inside of the air ducts. You need to totally tear it down and scrape out and wash all of the parts except the motor, which you vacuum out. Halfway doing it will not work. This includes the exhaust vent, all the way, even the outlet on the side of the house if you have one. You can go to YouTube to see videos on how to take it apart, but do a very good job or it will fail again quickly. I would get a new belt and change it while you have it apart and get some white lithium grease and grease any bearings you find. You need to clean out a drier every two years, at least, according to the manual. All sensors work together by comparing temperature, so all need to be cleaned. You just unplug the wires from the sensors and remove ductwork that they are attached on and clean the entire thing with soap and water. Make sure you go all through the dryer and get all parts like the blower fan and housing, vacuum out motor well and clean exhaust. Mark all wires you unplug so you know where they go. This is an easier job than you would think. You need a meter to test any fuses that may be blown, which I strongly suspect is the case. You will see them on the schematic diagram.
See: Dryer vent cleaning prevents fires - YouTube (http://www.youtube.com/watch?v=A6wmD502-xE) and: Cleaning out a dryer with top lint cleanout - YouTube (http://www.youtube.com/watch?v=OBNDbyRm68M&feature=fvsr)
Cleaning out a dryer: By a woman 2 of 2 - YouTube (http://www.youtube.com/watch?v=a73HTFkcB90&feature=relmfu)
Manuals: http://dl.dropbox.com/u/8010163/Kenmore%20Dryer%20Manuals.zip

The "F1" fault code is indicating a shorted keypad, electronic oven control board failure or the oven sensor probe (RTD) may have gone bad. A technician would follow the suggested corrective procedure to determine which component has failed. It will either have a bad oven sensor probe (RTD) or a failed Electronic Oven Control (EOC) board.

The "F1" fault code is indicating a shorted keypad, electronic oven control board failure or the oven sensor probe (RTD) may have gone bad. A technician would follow the suggested corrective procedure to determine which component has failed. It will either have a bad oven sensor probe (RTD) or a failed Electronic Oven Control (EOC) board.

Said it was a dryer, not an oven.

If you will tear it down and clean it, plus check the safeties you will be able to repair it. Any good dryer has safeties to prevent it from running and burning the house down, still it happens many times each year.