Does not dry clothes

Can only be a few things

high temp fuse
high limit thermostat
failed element.

VIDEO

https://www.youtube.com/watch?v=fv2UqRUKnm0

Parts

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The Dryer Thermal Fuse (Thermal Cutoff, Temperature Fuse) is a 2 by ½ inch, white, plastic safety mechanism that stops the flow of electricity to the motor circuit ...

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sounds to me like the motor coupling is broken,this youtube video will show you how to replace it
http://youtu.be/9K1KHEogf3c

yes they r a known part 2 go bad if he has a elec meter tell him to check 2 see if there is conten through it once he un plugs the ignitor. also on the back inside back panel there is a sensor that could of went bad it is white about 1.5in long ck that also 4 contenthe parts r very easy 2 change.

The motor coupler may be broken. Many Whirlpool®-manufactured washers use a small, relatively inexpensive motor coupling. It's plastic and rubber and is mounted to the shaft of the motor on one side, and to the transmission on the other. Over time, the coupler wears out and fails. You may need to replace it.

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

clutch could be it check if nothing is jammed between tub andbasket. if u have an oily tranny i would replace it

SOUNDS LIKE YOVE GOT A CLO OF LENT IN THE LINT BASKET CLEAN AND LET ME KNOW HOW IT TURNS OUT

You found a belt? Most w/p washer do not have a belt they are direct drive. take off the pump and motor to replace the motor coupling, 2 plastic pieces w/ a rubber in between

examine all the ducts in the dryer, and the fan and fan housing for lint. Lint buildup stops the air exiting the dryer
cant get out
cant get in
no air
no dry
surprising how much lint you can get out of a dryer

UNPLUG
after clearing all the lint,
examine devices::
thermal fuses, thermostats and the heater element for conductivity.
remove 1 wire from each to isolate from the circuit, test with ohmmeter or battery and bulb, replace wire
when cold all devices in the heater circuit should conduct

when cold a small device in the motor circuit that looks the same as all the other devices, a cool down thermostat does NOT conduct
devices: may all look alike,
to open dryer case read any of the 'changing dryer belt' questions or the good instruction manual posted by Joks

if its a 2 piece agitator.. the gears in top of agitator is stripped out.. change gears be like new....spin top countor clockwise if it dont grap.. gears bad