CONCERN: Customer reports dryer is not heating. CAUSE: Inspected dryer wall receptacle for proper voltage to the dryer, voltage to the dryer is normal at the time of inspection. Inspected dryer terminal block and cord for visible shorts, no shorts found at terminal block or cord at the time of inspection. Inspected dryer heater continuity on the heater element, heating element tested good at the time of inspection, Tested thermal safety for continuity, no continuity present, Found dryer thermal safety shorted out. CORRECTION: Replaced dryer thermal safety and tested. Operation now normal. CONCERN: Dryer takes too long to dry clothes, dryer does get hot though. DIAGNOSTIC AND CAUSE: Tested dryer for proper heater element operation. Heater operation is normal. Inspected heater thermostat operation for short cycling condition, thermostat is short cycling. Inspected dryer air flow at the duct flume, air flow is normal at this time, no signs of flow restriction. Cause, Wall vent clogged wi