Electric dryer stopped heating today. Kenmore 80 series 64892. There was quite a bit of lint build up in the exhaust hose when I removed. The dryer wasn't drying well for some time. A Sears tech. came out about 6 or 8 months ago and didn't find a problem. But the dryer continued to take 2 plus hours to dry a load of clothes.

Usual suspects are:
heating element
thermal overload fuse
thermostat bimetal switch

ELECTRIC Dryer no heat or little heat:

Check your venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)

Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective.

Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage. 220 because if u only get half or 110 volts you will be able to run the machine which uses only 110 to run motor but not the heater which uses a full 220,

Check the thermal cut off, the cycling and the hi limit thermostats.
For continuity or OHMS. If no ohms or resistance they need replacement.

Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.

Is it gas or electrric? Either one i would check the dryer vent hoses. Check the lint trap as well. The lint trp is the exit for the hot air to circulate. Sometimes if clogged with lint these dryers could go either way they could over heat and cause a fire or cause the element or thermostat to fail. The electric dryers have a thermostat and a heating element. Those tend to go bad. Back panel should be taken off and unplug unit check.

remove the entire exhaust vent and clean it thoroughly. Any build up of lint inside of it will cause the moister sensor in the dryer to shut down the burner or grid which ever you have, gas or electric
After cleaning it and it still does not work correctly the sensor is at fault and needs to be replaced

that is ur glow bar or igniotror that is common,, check ur ignitor, thermal fuse, or secondary gas coils, those are what are usually wrong with no heat on gas dryers

Could be a broken heating element or a safety limit . The safety would open if you have some sort of air restriction due to lint or kink in hose. I have some repair photos HERE

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If this is a new element, this is normal until it has been used a few cycles. Use it and watch it carefully for a while. If it continues have a competent person to take the rear panel off and check for burnt wires or lint inside the unit.

heating element might have gone out or the exhaust might be clogged. I took my vacuum hose and stuck it up the exhaust ( I think that's what it's called) and got a canister and a half of lint out. Then my dryer worked fine.

change the fuse in back of the dryer

Check the tubing the lint goes through (exhaust). This may be stopped up or clogged. There is a build up here of heat or something that is preventing proper air flow.