i HAD THE VENT OFF AND IT HEATED UP IMMEDIATELY, CLEANED VENT AND HOOKED BACK UP AND HEATED UP IMMEDIATELY. WASHED LOAD OF CLOTHES THIS MORNING, WENT TO DRY, SMAE ISSUE, NOT HEATING UP.
If you have plenty of air coming out of the vent, you can be SURE your heating element is OK. Heaters and thermal fuzes blow on bad venting, or just wear out but not too often. Go to partselect to get take apart info, look for burnt wires.
If it is electric, check your heating coil element , if it is open then replace it. If is gas then check your thermostat that is the one controlling the heat, if bad then replace it, you need a meter in order to verify.