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If you are having problems with your gas dryer not heatingthe most common problem is that the ignitor goes bad. Even though it glowssometimes 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 differentthings that can go wrong causing the dryer not to heat.
check outthis electric no heat tip...
Make sure you have 240 Volts going to the dryer. The motor runs on 120 Volts, but the element needs 240 Volts. If that checks out, you would need to trace the wiring using the wiring schematic. That could be fun.
The problem is either the flame sensor or dryer coils. First check the flame sensor also called the radiant heat sensor for continuity. If it has none replace it. If it does have continuity the dryer coils need replacing. They are easy to check and replace. Here are a few links that should help
yes the belt has a tensioner with a bearing and a roller surrounding the bearing
the bearing can be locked up which will put flat spots in the roller m,aking the banging noise
Sound horrifying at times doesn't it?
Dryer ignitors are not as tempermental as oven ignitors. If it glows, the problem is most likely is not the ignitor. One of the coils on the gas valve is the problem, but with LG, you have to get the entire gas valve, as the coils are not available as seperate parts. By the way, if you are testing the dryer with the front off, you have to make sure to cover the drum opening with something (like a piece of cardboard) so that you will maintain proper air flow for the burner.
1. Gas valve coils
Igniter glows, then shuts off without igniting gas - the problem is
probably with defective coils (black, located on top of the gas
valve). It is recommended to replace all coils (usually two or
three) if found defective.
Note: Sometimes the whole gas valve may be defective, thus not
letting the gas out. However, this problem is not common.
2. Thermal fuse
Most dryers have a thermal fuse, which burns out when the dryer
overheats, in which case the dryer will either not run at all or
stop heating. The fuse is usually located on the vent duct, inside the
dryer. A blown fuse will show no continuity when measured with a
meter. Before replacing the fuse, make sure the blower wheel is not
broken or clogged, and there is nothing blocking the venting.
Note: It is recommended by most dryer manufacturers to replace a
hi-limit thermostat when replacing a thermal fuse.
Igniter may burn out or break. Replace the igniter if found
Note: Igniters are very fragile and break easily. It is recommended
to handle the igniter only touching the ceramic part of it (usually
white in color).
4. Flame sensor (or radiant heat sensor)
Replace the sensor (located near the igniter) if found defective.