I have a whirlpool duet electric dryer. It is about 5 years old. It heats up, but seems to take too long to dry a load. It can take 2 hours to dry a load of towels or jeans. It did not use to take that long. We cleaned out the lint trap and the vent and the whole entire thing. My husband even removed the back cover and checked for blockages and cleaned out the whole thing with an air compressor. Any suggestions?
A1 Pull the dryer out away from the wall. Unhook the vent from the dryer completely. Do not put anything over the dryer exhaust on the back of the dryer. Do a normal load with the vent unhooked. If it dries better or ok like this then the problem is in the dryer venting. Like a blocked vent pipe or a smashed or restricted vent hose.
A2 - If the vent doesn't make a difference, then check the blower wheel for excessive lint build up, check that there isn't anything stuck to the air intake baffle inside the drum, (i.e. the screen on the back wall of the dryer when looking into the drum). Check the lint filter chute for blockage. Check that the heating element isn't shorted to ground. Check the exhaust temperature of the dryer. A meat or pocket thermometer can be used for this. It should cycle between 120 degrees and 170 degrees. Check that the drum seals to make sure the are not worn out.
Hi,
If you are having problems with your
gas dryer not heating the most common problem is that the ignitor
goes bad. Even though it glows sometimes it is still not working
properly.
if
you dryer is gas check out this gas
no heat
tip....
If you have an electric dryer, you can
have many different things that can go wrong causing the dryer not to
heat.
check
out this electric
no heat
tip...
heatman101
For a detailed Dryer illustration, click below. 
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Checked out everything you suggested and all checks out okay.
Any other ideas?
If you have already cleaned the lint trap and vent, and there are no blockages in the dryer itself, there are a few other things that could be causing your Whirlpool Duet electric dryer to take too long to dry. Here are a few possible solutions:
Check the heating element: If the heating element is faulty or damaged, it may not be heating the air inside the dryer properly. You can use a multimeter to check the continuity of the heating element. If it is faulty, it will need to be replaced.
Check the thermostat: The thermostat regulates the temperature inside the dryer. If it is faulty, it may be causing the dryer to overheat or not heat up enough. You can use a multimeter to check the continuity of the thermostat. If it is faulty, it will need to be replaced.
Check the moisture sensor: Many modern dryers have a moisture sensor that detects the level of moisture in the clothes and adjusts the drying time accordingly. If the moisture sensor is faulty or dirty, it may not be functioning properly. Clean the sensor or replace it if necessary.
Check the exhaust duct: Even if you have cleaned the vent and duct, there may still be blockages or restrictions that are preventing the dryer from venting properly. Check the exhaust duct for any obstructions or damage, and make sure it is properly installed and sealed.
Check the blower wheel: The blower wheel is responsible for circulating air inside the dryer. If it is damaged or clogged with lint, it may not be able to circulate enough air to dry the clothes properly. Clean or replace the blower wheel if necessary.
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