On gas and electric dryers that have an "auto dry" cycle, the cycling thermostat is often used to advance the timer as well regulate the drum temperature essentially, the thermostat will alternately turn on the heat source or the timer motor when the temperature has been satisfied how to test a dryer cycling thermostat with a multi-meter:. Whirlpool gas dryer timer not working. If your gas or electric dryer isn’t doing the auto dry cycle correctly, it may be the fault of a defective cycling thermostat this part governs the temperature of the dryer and also the operation of the timer motor on auto dry models. whirlpool gas dryer timer not working Wiring diagram for roper dryer | better wiring diagram online It was running but not heating turns o...