Cleaned circuit board, cleaned duct
In most cases, this is an indication of a failing timer unit. The video below demonstrates replacing the timer assembly. Most makes and models follow the same procedure.
SOURCE: Whirlpool electric dryer
either you are pushing the dryer back to far and crushing the exhaust vent hose .your exhaust vent going outside is stopped up , or your low temp thermo will not let the dryer cycle and it is over heating.
SOURCE: kenmore gas dryer not heating
GAS DRYER, NO HEAT. CHECK THE HEAT SETTING FIRST.
IS IT ON AIR FLUFF? I'M NOT BEING SMART, BUT YOU WOULD BE SURPRISED HOW MANY CALLS I TAKE THAT ARE ON AIR FLUFF. SECOND, LISTEN FOR A DISTINCT CLICK WHEN YOU TURN ON THE DRYER. IF YOU HEAR IT, LOOK IN THE INSPECTION HOLE ON THE FRONT OF THE DRYER, OR REMOVE THE TOE PLATE TO VIEW THE IGNITOR. IF THE IGNITOR GLOWS AND THEN CLICKS OFF BUT NO FLAME, YOU HAVE A BAD SOLENOID ON THE GAS VALVE. IF THE IGNITOR GLOWS, BUT NEVER CLICKS OFF, THE RADIANT SENSOR ATTACHED TO THE SIDE OF THE BURNER ASSEMBLY IS BAD.
IF YOU DON'T HEAR A DISTINCT CLICK WHEN YOU TURN ON THE DRYER, THE MOST LIKELY CAUSE IS THE THERMAL FUSE LOCATED ON THE BACK OF THE DRYER DOWN NEAR THE EXHAUST DUCT. IT IS A SMALL WHITE ITEM ATTACHED TO THE EXHAUST DUCT WITH TWO WIRES ATTACHED.
SOURCE: my kenmore 80 series dryer won't heat but
Had similiar problem once and it turned out to be one leg of the 240 volt
supply was dead. The drum motor only needs one leg (120V) to run, but the Heating elements require both legs (240v). Make sure you have 240V at the recep.
SOURCE: the check filter light keeps coming ob to my lg
Clean the vent all the way to the outside.
The dryer will take 4-5 loads to reset the filter sensor.
Mahe sure the vent is not smashed behind the dryer.
SOURCE: dryer is not heating up to dry clothes
The spark ignitor maybe at fault. Listen for the clicking noise upon starting it up the first 30 seconds it runs. If not heard it is in need of a replacement
Hello Tony Palow - Have you recently cleaned the ducting? Confirm that it doesn't have any debris or build up. Try reprogramming the unit by unplugging it or flipping the household circuit breaker off. Wait approximately ten minutes and if the unit still does not dry, I would recommend contacting a professional to proceed further since it could be any one of several underlying causes. Most than likely the dryer has a faulty control board, heating element, blower assembly, thermostat, sensor or damaged cord.
thermal cuttouts look like these ~1inch accross. 
you get a lot of lint out of the fan even when proper cleaning is done, and clean out the ducting right to the exterior walls
this was the rather extreme result of not cleaning the duct (brainiac placed a wire across the terminals of the burnt out thermal fuse)
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