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Must be a gas model. They typically do that when the gas solenoids get age on them. They work once then quit, then work some more when cooled back down after a long period of time. Very hard to diagnose for the DIY person but pretty much a common probo associated gas dryers. Swap out the solenoids and party on! If your is an electric model I would check the vent pipe or filter chute for parcial blocking which might cause safety themostats to shut down the heat.
if u get lil bit of heat and takes along time then its inside your venting.
if no heat at all on a gas dryer, check your thermal fuse or themostats on the backside with a meter for continutiy if it reads sometin its okay if reads nothin it is defective and replace it...
also check the ignitor/glow bar these sometimes burn out, or they have these coils they call em there are 2 of them i think secondary coils is the proper term they are black usually and sold in a pair one has 2 conncections and the other has 3
so either an ignitor,fuse or thermostat, or those coils
The timer runs a hot leg over to the control themostat and then through a centrifugal switch on the motor over to a fuse on the blower housing and into the gas assembly itself. When power is applied the ignitor gets real hot 1800F. The sensor is also in the same circuit as the ignitor and the gas operator coils. The coils won't yank open the gas till that ignitor goes out because it is hogging most all the juice. The sensor kicks out and kills the ignitor, both drop out of th circuit. That unleases the amps to them coils which yank up the gates and let the gas go flowing out to that hotazz ignitor. Kawooosh!!! Houston we has ignition.
If it heats w/ the timer in off position whenever plugged in the the element is shorting to ground, its most likely due to either a broken coil or a cracked insulator. If heating w/ timer set for drying but motor is not running, the heat circuit thru the centrifugal/start switch on the motor is stuck closed.