The coin operator timer consists of several small plastic gears. The teeth on the last plastic gear gets all chewed up so that the timer continues to run and unable to open the circuit which stops the dryer timer. Although the plastic gear probably costs pennies, your will need to order part number 33001275 torsion timer for about $75 - $110. Remove one screw & 3 clip-on wires - 15 min.
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Will the timer advance in the NO HEAT mode? If it does advance you would know it has something to do with the temp alright but if it don't advance in No Heat then the timer motor is bad in my opinion. And it can fail by more than one way. Open winding OR stripped motor gear.
Motor runs, but main burner will not ignite
1.heat switch set wrong---correct switch setting
2.defective timer or timer circuit---check timer wiring--replace timer motor or switch as needed
3.defective centrifugal switch in motor---clean switch or replace as needed
4.gas supply valve closed----open gas valve
5.inoperative solenoid coil---test coil for open circuit & the voltage to it
Pilot burner goes out
1.insufficient gas supply---- low gas pressure or clogged pilot filter or partially closed gas valve
2.carbon deposit on thermocouple tube---clean tube & check pilot burner for proper combustion
3.improperly adjusted pilot flame--adjust pilot flame until faint yellow tip begins to appear
4.faulty ignition or reset valve or thermocouple---replace
Clothes not drying, but dryer runs & heats
1.defective operating thermostat---test thermostat, replace if defective
2.fan or it's pulley loose on shaft---tighten set screw
3.incorrect heat or timer settings---reset timer
4.clothes to wet when placed in dryer----wring out or extract water from clothes before placing in dryer
5.clogged lint screen or duct (little air motion)---clean out lint screen & duct
One way you could isolate the problem is to unplug the quick connect to the transformer and take the heat portion out of the equation ( just to see if the dryer starts on it own only). If the starting on it own goes away then you have it somewhere in that portion of the cycle. Probably 2 wires rubbing somewhere. Why do we need a dang transformer in a dryer? That would be the suspect to me. Never even seen this before. Hope you get a solution. Hope you post it.
It could be several other things thermal fuse, thermal cut out, hi limit thermostat, dryer coils, heat sensor,or ignitor. All of these parts are inexpensive and easy to test and replace.There is a free video at www.appliancehelponline.com/servicemanual.html this will walk you thru the troubleshooting of these components. It may be a different model but the troubleshooting will be the same.You can also enter your model # for diagrams and illustrations. Not all models are available. If you need help disassembling your machine there are videos of this also for most styles.