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if your dryer feels hot inside and the drum tumbles then you have a blocked vent. check that the venting blows to the outside. do this test. unhook the vent behind the dryer, dry a load of clothing and if it dry on the first time then you know the house vent is clogged. cleaned or if you live in an appartment have maintenance clean.
make sure the vent system is clean. any restrictions can cause the safety switches to activate and turn off heaters. When it cools, the switch resets and starts heating. Unit will continue to cycle the heat off and on. Make sure all elements are working.
Due to a dryer either heats or no heat , I would suggest pulling the dryer out and removing the vent hose . Dry a load of clothes to see if they dry normally . If they do , this verifys that the vent hose is either kinked ( restricting air flow ) , or , if the vent runs UP inside the wall , there is a restriction between the inside vent hose to the outside vent . May have to go into the attic to clean .
Note: Normal drying time for a dryer
is about 45 minutes (some may take up to an hour).
Make sure the dryer vent hose, as well as the rest of the vent duct,
is not clogged.
Unless regular maintenance is performed, chances are there is a lot
of lint accumulated inside the dryer. This might affect the drying
time and could be a fire hazard. Make sure to have your dryer
cleaned regularly. Because this might involve taking most of the
dryer apart, it is recommended to have a qualified appliance
repairman perform this task.
There are a couple of cycling thermostats inside the dryer. If one
of them breaks down, it might affect the dryer's performance.
Replace the defective thermostat.
3. Heating element
A heating element might only be partially burned out, in which case
it would still work but will take longer time to dry the clothes.
Replace the element if found defective.
Very common problem. You need to call a duct cleaning company and tell them to clean your dryer vent. Rule-of-thumb: dryer vents should be cleaned every couple of years to prevent them from being clogged with lint and causing lint fires. This is definitely your problem. Good luck :)
p.s. one way to verify a clogged vent is to go outside where the vent exits the house and feel the air-flow. should have adequate air-flow.