There are three main culprits that could be your problem: Unplug your dryer and first, check the thermal fuse located on the blower assembly. It's about an inch long, white plastic piece that has two terminals sticking up. Disconnect one of the leads to it and use an ohmeter to check continuity. It should read a short if it's good. If that's not it, hook the lead back up that you took off to test the thermal fuse, plug your dryer back into the outlet and turn on your dryer and watch your glow bar. It should glow brightly. If it doesn't, then replace the glow bar. If it does glow brightly, but you still aren't getting any flame, replace the gas valve coils. If, that doesn't do it, then the final most likely culprit is the flame sensor (also called a "radiant sensor").
Good luck!
SOURCE: kenmore gas dryer after 5 to 10 min. later no more heat
Yup, shortly after I posted this question I was able to find that it was indeed the valve coils. Very easy to get to and replace. Cheap too! Got both of them for about $20 thru www.appliancepartspros.com. Same parts would have cost about $70 thru Sears direct.
Patrick, they are located on the burner unit under the drum in the front left. You can get a diagram of the burner unit by looking up Parts for your model # at Sears.com.
Only tricky thing is you may need to have someone help hold the tumbler in place when you put the belt back on the motor. Personally I found it easier to use two hands to manipulate the belt around the motor and tension bracket and have my wife hold the drum in place rather than to try and balance it myself.
Good luck!
SOURCE: ROPER DRYER WILL NOT HEAT
Put the back panel back, and hope you havent done permanent damage
the back does not come off roper dryers for service
the front does
the back panel serves solely as a mounting point for important fixtures
there is no reset button
there are thermal fuses, if the thermal fuse, mounted on the exhaust duct or fan housing has failed, it must be replaced, but they are not expensive
look like this 
to access the dryer mechanism
unplug dryer
remove lint filter
remove 2 screws under lint filter
with putty knife or other blunt blade, depress spring catches at front corners of top cover
raise front cover
remove 1 screw each side of front panel 1/3 from top
remove door switch wires
remove front panel set aside
test all thermostats heater and thermal fuse with ohmmeter, remove 1 wire test for conduct replace wire, no conduct replace
the local parts store will have the part, labelled whirlpool, ~$14 for thermal fuse, ~$40 if heater
examine rear panel reinstall any thing that is dismounted
while the dryer is open
Clean the lint out of fan, fan housing, ducts
airflow blockage is the 99% cause of thermal fuse blowing, some lint always gets past the lint screen
SOURCE: I just moved and my LG dryer does not heat up.
Your ignitor (glow bar) got broken during the move. They are more fragile than your grandmother's fine china
SOURCE: dryer tumbles, no heat
its a gas dryer it doesnt have ,,heating element...replace thermal fuse
SOURCE: Whirlpool Imperial seventy dryer does not heat up
If there is a copper line feeding gas to it, PULL THE DRYER WAY FROM THE WALL AND TURN THE GAS OFF AT THE VALVE IMMEDIATELY!
Natural gas and copper do not mix, and the copper line will corrode from the inside out.
Now, on to the problem, it's very likely the timer has failed IF it does not rotate all the way through the drying cycle. If it does, and the clothes do not heat up, then reply back what you are experiencing and I will give you move help.
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
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