THERE ARE PLENTY OF ONLINE SCHEMATICS  AND DO IT YOUR SELF APPLIANCE REPAIR WEBSITES..DO A SEARCH AND PLEASE HAVE YOUR MAKE AND MODEL NUMBER HANDY..PULL THE FRONT PANEL OFF AND START THE DRYER..MOST APPLIANCE REPAIR WEBSITES WILL GO INTO DETAIL ON HOW TO PULL THE PANEL AND WHERE AND WHAT TO LOOK FOR ONCE INSIDE THE DRYER..SEE IF THE IGNITOR GLOWS HOT AND THE GAS STARTS TO IGNITE.IF THE IGNITOR GLOWS RED HOT AND THE GAS LIGHTS (LOOK FOR A BLUE FLAME) BUT THE GAS DOESNT STAY ON LONG ENOUGH TO HEAT THE DRYER, CHANCES ARE THE PROBLEM IS WITH THE COILS...YOU CAN BUY THE COIL SET (SET OF 2) AT MOST APLIANCE STORES THAT CARRY PARTS..ONLINE I HAVE FOUND THEM FOR $40.00 BUT LOCALLY I WAS ABLE TO GET THEM FOR LESS THAN $20.00.. ITS A SIMPLE FIX WITH ONLY A COUPLE SCREW DRIVERS AND A SMALL SOCKET WRENCH TO DO THE JOB..